package app

import (
	"context"
	"encoding/json"
	"fmt"
	"regexp"
	"strings"
	"time"

	"github.com/google/uuid"

	"github.com/geo-platform/tenant-api/internal/shared/auth"
	"github.com/geo-platform/tenant-api/internal/shared/llm"
	"github.com/geo-platform/tenant-api/internal/shared/response"
	"github.com/geo-platform/tenant-api/internal/tenant/prompts"
	"github.com/geo-platform/tenant-api/internal/tenant/repository"
)

const (
	templateAssistTaskTypeAnalyze = "analyze"
	templateAssistTaskTypeTitle   = "title"
	templateAssistTaskTypeOutline = "outline"
)

type AssistCompetitor struct {
	Name        string `json:"name"`
	Website     string `json:"website,omitempty"`
	Description string `json:"description,omitempty"`
}

type AnalyzeTaskRequest struct {
	Locale              string                 `json:"locale"`
	BrandID             *int64                 `json:"brand_id,omitempty"`
	BrandName           string                 `json:"brand_name"`
	Website             string                 `json:"website,omitempty"`
	InputParams         map[string]interface{} `json:"input_params,omitempty"`
	ExistingKeywords    []string               `json:"existing_keywords,omitempty"`
	ExistingCompetitors []AssistCompetitor     `json:"existing_competitors,omitempty"`
}

type AnalyzeTaskResult struct {
	BrandSummary string             `json:"brand_summary"`
	Keywords     []string           `json:"keywords"`
	Competitors  []AssistCompetitor `json:"competitors"`
}

type TitleTaskRequest struct {
	Locale       string                 `json:"locale"`
	BrandID      *int64                 `json:"brand_id,omitempty"`
	BrandName    string                 `json:"brand_name"`
	Website      string                 `json:"website,omitempty"`
	BrandSummary string                 `json:"brand_summary,omitempty"`
	InputParams  map[string]interface{} `json:"input_params,omitempty"`
	Keywords     []string               `json:"keywords,omitempty"`
	Competitors  []AssistCompetitor     `json:"competitors,omitempty"`
}

type OutlineTaskRequest struct {
	Locale          string                 `json:"locale"`
	BrandID         *int64                 `json:"brand_id,omitempty"`
	BrandName       string                 `json:"brand_name"`
	Website         string                 `json:"website,omitempty"`
	BrandSummary    string                 `json:"brand_summary,omitempty"`
	Title           string                 `json:"title"`
	InputParams     map[string]interface{} `json:"input_params,omitempty"`
	Keywords        []string               `json:"keywords,omitempty"`
	Competitors     []AssistCompetitor     `json:"competitors,omitempty"`
	OutlineSections []string               `json:"outline_sections,omitempty"`
	KeyPoints       string                 `json:"key_points,omitempty"`
}

type OutlineNode struct {
	Outline  string        `json:"outline"`
	Children []OutlineNode `json:"children,omitempty"`
}

type AssistTaskCreateResponse struct {
	TaskID  string `json:"task_id"`
	Status  string `json:"status"`
	Message string `json:"message"`
}

type AnalyzeTaskResultResponse struct {
	TaskID       string             `json:"task_id"`
	Status       string             `json:"status"`
	Message      string             `json:"message"`
	Result       *AnalyzeTaskResult `json:"result,omitempty"`
	ErrorMessage *string            `json:"error_message,omitempty"`
}

type TitleTaskResultResponse struct {
	TaskID       string   `json:"task_id"`
	Status       string   `json:"status"`
	Message      string   `json:"message"`
	Result       []string `json:"result,omitempty"`
	ErrorMessage *string  `json:"error_message,omitempty"`
}

type OutlineTaskResultResponse struct {
	TaskID       string        `json:"task_id"`
	Status       string        `json:"status"`
	Message      string        `json:"message"`
	Result       []OutlineNode `json:"result,omitempty"`
	ErrorMessage *string       `json:"error_message,omitempty"`
}

type assistJob struct {
	TaskID         string
	TaskType       string
	TenantID       int64
	TemplateID     int64
	TemplateKey    string
	TemplateName   string
	AnalyzePrompt  *string
	TitlePrompt    *string
	OutlinePrompt  *string
	AnalyzeRequest *AnalyzeTaskRequest
	TitleRequest   *TitleTaskRequest
	OutlineRequest *OutlineTaskRequest
}

type AssistJob = assistJob

func (s *TemplateService) CreateAnalyzeTask(ctx context.Context, templateID int64, req AnalyzeTaskRequest) (*AssistTaskCreateResponse, error) {
	actor := auth.MustActor(ctx)

	templateRecord, err := s.templates.GetTemplateByID(ctx, templateID, actor.TenantID)
	if err != nil {
		return nil, mapTemplateLookupError(err)
	}
	if err := s.llm.Validate(); err != nil {
		return nil, response.ErrServiceUnavailable(50311, "llm_unavailable", err.Error())
	}

	req = normalizeAnalyzeTaskRequest(req)
	if !hasAnalyzeContext(req) {
		return nil, response.ErrBadRequest(40012, "analyze_context_required", "brand info or template context is required")
	}

	payload, err := json.Marshal(req)
	if err != nil {
		return nil, response.ErrInternal(50020, "marshal_failed", "failed to encode analyze request")
	}

	taskID := uuid.NewString()
	reservation, err := s.reserveTemplateAssistAIPoints(ctx, actor.TenantID, actor.UserID, templateID, taskID, templateAssistTaskTypeAnalyze, buildAnalyzeAIPointMeteredText(req))
	if err != nil {
		return nil, err
	}

	repo := repository.NewTemplateAssistTaskRepository(s.pool)
	if err := repo.CreateTask(ctx, repository.CreateTemplateAssistTaskInput{
		ID:          taskID,
		TaskType:    templateAssistTaskTypeAnalyze,
		TenantID:    actor.TenantID,
		OperatorID:  actor.UserID,
		TemplateID:  templateID,
		RequestJSON: payload,
	}); err != nil {
		s.refundReservedAIPoints(context.Background(), actor.TenantID, actor.UserID, reservation, err.Error())
		return nil, response.ErrInternal(50021, "task_create_failed", err.Error())
	}

	job := assistJob{
		TaskID:         taskID,
		TaskType:       templateAssistTaskTypeAnalyze,
		TenantID:       actor.TenantID,
		TemplateID:     templateID,
		TemplateKey:    templateRecord.TemplateKey,
		TemplateName:   templateRecord.TemplateName,
		AnalyzePrompt:  extractAnalyzePromptTemplate(templateRecord.CardConfigJSON),
		AnalyzeRequest: &req,
	}
	if err := publishTemplateAssistTask(ctx, s.rabbitMQ, job); err != nil {
		_ = repo.FailTask(context.Background(), taskID, templateAssistTaskTypeAnalyze, actor.TenantID, err.Error(), time.Now())
		s.refundReservedAIPoints(context.Background(), actor.TenantID, actor.UserID, reservation, err.Error())
		return nil, response.ErrServiceUnavailable(50312, "analyze_queue_unavailable", "analyze queue is busy, please retry")
	}

	return &AssistTaskCreateResponse{TaskID: taskID, Status: "queued", Message: "queued"}, nil
}

func (s *TemplateService) GetAnalyzeTask(ctx context.Context, templateID int64, taskID string) (*AnalyzeTaskResultResponse, error) {
	actor := auth.MustActor(ctx)
	repo := repository.NewTemplateAssistTaskRepository(s.pool)

	record, err := repo.GetTask(ctx, taskID, templateAssistTaskTypeAnalyze, actor.TenantID, templateID)
	if err != nil {
		if err == repository.ErrTemplateAssistTaskNotFound {
			return nil, response.ErrNotFound(40411, "analyze_task_not_found", "analyze task not found")
		}
		return nil, response.ErrInternal(50022, "task_query_failed", err.Error())
	}

	resp := &AnalyzeTaskResultResponse{
		TaskID:       record.ID,
		Status:       record.Status,
		Message:      assistTaskMessage(record.Status),
		ErrorMessage: record.ErrorMessage,
	}
	if len(record.ResultJSON) > 0 {
		var result AnalyzeTaskResult
		if err := json.Unmarshal(record.ResultJSON, &result); err != nil {
			return nil, response.ErrInternal(50023, "task_result_invalid", err.Error())
		}
		resp.Result = &result
	}

	return resp, nil
}

func (s *TemplateService) CreateTitleTask(ctx context.Context, templateID int64, req TitleTaskRequest) (*AssistTaskCreateResponse, error) {
	actor := auth.MustActor(ctx)

	templateRecord, err := s.templates.GetTemplateByID(ctx, templateID, actor.TenantID)
	if err != nil {
		return nil, mapTemplateLookupError(err)
	}
	if err := s.llm.Validate(); err != nil {
		return nil, response.ErrServiceUnavailable(50311, "llm_unavailable", err.Error())
	}

	req = normalizeTitleTaskRequest(req)
	if !hasTitleContext(req) {
		return nil, response.ErrBadRequest(40013, "title_context_required", "title generation context is required")
	}

	payload, err := json.Marshal(req)
	if err != nil {
		return nil, response.ErrInternal(50024, "marshal_failed", "failed to encode title request")
	}

	taskID := uuid.NewString()
	reservation, err := s.reserveTemplateAssistAIPoints(ctx, actor.TenantID, actor.UserID, templateID, taskID, templateAssistTaskTypeTitle, buildTitleAIPointMeteredText(req))
	if err != nil {
		return nil, err
	}

	repo := repository.NewTemplateAssistTaskRepository(s.pool)
	if err := repo.CreateTask(ctx, repository.CreateTemplateAssistTaskInput{
		ID:          taskID,
		TaskType:    templateAssistTaskTypeTitle,
		TenantID:    actor.TenantID,
		OperatorID:  actor.UserID,
		TemplateID:  templateID,
		RequestJSON: payload,
	}); err != nil {
		s.refundReservedAIPoints(context.Background(), actor.TenantID, actor.UserID, reservation, err.Error())
		return nil, response.ErrInternal(50025, "task_create_failed", err.Error())
	}

	job := assistJob{
		TaskID:       taskID,
		TaskType:     templateAssistTaskTypeTitle,
		TenantID:     actor.TenantID,
		TemplateID:   templateID,
		TemplateKey:  templateRecord.TemplateKey,
		TemplateName: templateRecord.TemplateName,
		TitlePrompt:  extractTitlePromptTemplate(templateRecord.CardConfigJSON),
		TitleRequest: &req,
	}
	if err := publishTemplateAssistTask(ctx, s.rabbitMQ, job); err != nil {
		_ = repo.FailTask(context.Background(), taskID, templateAssistTaskTypeTitle, actor.TenantID, err.Error(), time.Now())
		s.refundReservedAIPoints(context.Background(), actor.TenantID, actor.UserID, reservation, err.Error())
		return nil, response.ErrServiceUnavailable(50313, "title_queue_unavailable", "title queue is busy, please retry")
	}

	return &AssistTaskCreateResponse{TaskID: taskID, Status: "queued", Message: "queued"}, nil
}

func (s *TemplateService) GetTitleTask(ctx context.Context, templateID int64, taskID string) (*TitleTaskResultResponse, error) {
	actor := auth.MustActor(ctx)
	repo := repository.NewTemplateAssistTaskRepository(s.pool)

	record, err := repo.GetTask(ctx, taskID, templateAssistTaskTypeTitle, actor.TenantID, templateID)
	if err != nil {
		if err == repository.ErrTemplateAssistTaskNotFound {
			return nil, response.ErrNotFound(40412, "title_task_not_found", "title task not found")
		}
		return nil, response.ErrInternal(50026, "task_query_failed", err.Error())
	}

	resp := &TitleTaskResultResponse{
		TaskID:       record.ID,
		Status:       record.Status,
		Message:      assistTaskMessage(record.Status),
		ErrorMessage: record.ErrorMessage,
	}
	if len(record.ResultJSON) > 0 {
		var result []string
		if err := json.Unmarshal(record.ResultJSON, &result); err != nil {
			return nil, response.ErrInternal(50027, "task_result_invalid", err.Error())
		}
		resp.Result = result
	}

	return resp, nil
}

func (s *TemplateService) CreateOutlineTask(ctx context.Context, templateID int64, req OutlineTaskRequest) (*AssistTaskCreateResponse, error) {
	actor := auth.MustActor(ctx)

	templateRecord, err := s.templates.GetTemplateByID(ctx, templateID, actor.TenantID)
	if err != nil {
		return nil, mapTemplateLookupError(err)
	}
	if err := s.llm.Validate(); err != nil {
		return nil, response.ErrServiceUnavailable(50311, "llm_unavailable", err.Error())
	}

	req = normalizeOutlineTaskRequest(req)
	if !hasOutlineContext(req) {
		return nil, response.ErrBadRequest(40014, "outline_context_required", "outline generation context is required")
	}

	payload, err := json.Marshal(req)
	if err != nil {
		return nil, response.ErrInternal(50028, "marshal_failed", "failed to encode outline request")
	}

	taskID := uuid.NewString()
	reservation, err := s.reserveTemplateAssistAIPoints(ctx, actor.TenantID, actor.UserID, templateID, taskID, templateAssistTaskTypeOutline, buildOutlineAIPointMeteredText(req))
	if err != nil {
		return nil, err
	}

	repo := repository.NewTemplateAssistTaskRepository(s.pool)
	if err := repo.CreateTask(ctx, repository.CreateTemplateAssistTaskInput{
		ID:          taskID,
		TaskType:    templateAssistTaskTypeOutline,
		TenantID:    actor.TenantID,
		OperatorID:  actor.UserID,
		TemplateID:  templateID,
		RequestJSON: payload,
	}); err != nil {
		s.refundReservedAIPoints(context.Background(), actor.TenantID, actor.UserID, reservation, err.Error())
		return nil, response.ErrInternal(50029, "task_create_failed", err.Error())
	}

	job := assistJob{
		TaskID:         taskID,
		TaskType:       templateAssistTaskTypeOutline,
		TenantID:       actor.TenantID,
		TemplateID:     templateID,
		TemplateKey:    templateRecord.TemplateKey,
		TemplateName:   templateRecord.TemplateName,
		OutlinePrompt:  extractOutlinePromptTemplate(templateRecord.CardConfigJSON),
		OutlineRequest: &req,
	}
	if err := publishTemplateAssistTask(ctx, s.rabbitMQ, job); err != nil {
		_ = repo.FailTask(context.Background(), taskID, templateAssistTaskTypeOutline, actor.TenantID, err.Error(), time.Now())
		s.refundReservedAIPoints(context.Background(), actor.TenantID, actor.UserID, reservation, err.Error())
		return nil, response.ErrServiceUnavailable(50314, "outline_queue_unavailable", "outline queue is busy, please retry")
	}

	return &AssistTaskCreateResponse{TaskID: taskID, Status: "queued", Message: "queued"}, nil
}

func (s *TemplateService) GetOutlineTask(ctx context.Context, templateID int64, taskID string) (*OutlineTaskResultResponse, error) {
	actor := auth.MustActor(ctx)
	repo := repository.NewTemplateAssistTaskRepository(s.pool)

	record, err := repo.GetTask(ctx, taskID, templateAssistTaskTypeOutline, actor.TenantID, templateID)
	if err != nil {
		if err == repository.ErrTemplateAssistTaskNotFound {
			return nil, response.ErrNotFound(40413, "outline_task_not_found", "outline task not found")
		}
		return nil, response.ErrInternal(50030, "task_query_failed", err.Error())
	}

	resp := &OutlineTaskResultResponse{
		TaskID:       record.ID,
		Status:       record.Status,
		Message:      assistTaskMessage(record.Status),
		ErrorMessage: record.ErrorMessage,
	}
	if len(record.ResultJSON) > 0 {
		var result []OutlineNode
		if err := json.Unmarshal(record.ResultJSON, &result); err != nil {
			return nil, response.ErrInternal(50031, "task_result_invalid", err.Error())
		}
		resp.Result = result
	}

	return resp, nil
}

func (s *TemplateService) executeAssist(ctx context.Context, job assistJob) {
	repo := repository.NewTemplateAssistTaskRepository(s.pool)
	now := time.Now()
	_ = repo.MarkRunning(ctx, job.TaskID, job.TaskType, job.TenantID, now)

	switch job.TaskType {
	case templateAssistTaskTypeAnalyze:
		s.executeAnalyzeTask(ctx, repo, job)
	case templateAssistTaskTypeTitle:
		s.executeTitleTask(ctx, repo, job)
	case templateAssistTaskTypeOutline:
		s.executeOutlineTask(ctx, repo, job)
	default:
		s.failAssist(ctx, job.TaskID, job.TaskType, job.TenantID, fmt.Errorf("unknown assist task type %q", job.TaskType))
	}
}

func (s *TemplateService) ProcessQueuedAssist(ctx context.Context, job assistJob) {
	s.executeAssist(ctx, job)
}

func (s *TemplateService) ProcessQueuedAssistJob(ctx context.Context, job AssistJob) {
	s.ProcessQueuedAssist(ctx, job)
}

func (s *TemplateService) IsAssistTaskTerminal(ctx context.Context, job AssistJob) (bool, error) {
	record, err := repository.NewTemplateAssistTaskRepository(s.pool).GetTask(
		ctx,
		job.TaskID,
		job.TaskType,
		job.TenantID,
		job.TemplateID,
	)
	if err != nil {
		return false, err
	}
	switch record.Status {
	case "completed":
		s.completeTemplateAssistAIPoints(ctx, job.TenantID, job.TaskID, "")
		return true, nil
	case "failed":
		if isTemplateAssistAIPointTask(job.TaskType) {
			resourceType := "template_assist_task"
			resourceUID := job.TaskID
			errorMessage := "template assist task failed"
			if record.ErrorMessage != nil && strings.TrimSpace(*record.ErrorMessage) != "" {
				errorMessage = strings.TrimSpace(*record.ErrorMessage)
			}
			_ = RefundPendingAIPointsByResource(ctx, s.pool, s.cache, job.TenantID, resourceType, nil, &resourceUID, errorMessage)
		}
		return true, nil
	default:
		return false, nil
	}
}

func (s *TemplateService) executeAnalyzeTask(ctx context.Context, repo repository.TemplateAssistTaskRepository, job assistJob) {
	if job.AnalyzeRequest == nil {
		s.failAssist(ctx, job.TaskID, job.TaskType, job.TenantID, fmt.Errorf("missing analyze request"))
		return
	}

	result, err := s.llm.Generate(ctx, llm.GenerateRequest{
		Prompt: buildAnalyzePrompt(job.TemplateKey, job.TemplateName, *job.AnalyzeRequest, job.AnalyzePrompt),
	}, nil)
	if err != nil {
		s.failAssist(ctx, job.TaskID, job.TaskType, job.TenantID, err)
		return
	}

	analyzeResult, err := decodeAnalyzeResult(result.Content)
	if err != nil {
		s.failAssist(ctx, job.TaskID, job.TaskType, job.TenantID, err)
		return
	}

	normalized := normalizeAnalyzeResult(*analyzeResult)
	resultJSON, err := json.Marshal(normalized)
	if err != nil {
		s.failAssist(ctx, job.TaskID, job.TaskType, job.TenantID, err)
		return
	}

	if err := repo.CompleteTask(ctx, job.TaskID, job.TaskType, job.TenantID, resultJSON, time.Now()); err != nil {
		s.failAssist(ctx, job.TaskID, job.TaskType, job.TenantID, err)
		return
	}
	s.completeTemplateAssistAIPoints(ctx, job.TenantID, job.TaskID, result.Model)
}

func (s *TemplateService) executeTitleTask(ctx context.Context, repo repository.TemplateAssistTaskRepository, job assistJob) {
	if job.TitleRequest == nil {
		s.failAssist(ctx, job.TaskID, job.TaskType, job.TenantID, fmt.Errorf("missing title request"))
		return
	}

	result, err := s.llm.Generate(ctx, llm.GenerateRequest{
		Prompt: buildTitlePrompt(job.TemplateKey, job.TemplateName, *job.TitleRequest, job.TitlePrompt),
	}, nil)
	if err != nil {
		s.failAssist(ctx, job.TaskID, job.TaskType, job.TenantID, err)
		return
	}

	titles, err := decodeTitleResult(result.Content)
	if err != nil {
		s.failAssist(ctx, job.TaskID, job.TaskType, job.TenantID, err)
		return
	}

	normalized := normalizeStringList(titles, 5)
	if len(normalized) == 0 {
		s.failAssist(ctx, job.TaskID, job.TaskType, job.TenantID, fmt.Errorf("title result is empty"))
		return
	}

	resultJSON, err := json.Marshal(normalized)
	if err != nil {
		s.failAssist(ctx, job.TaskID, job.TaskType, job.TenantID, err)
		return
	}

	if err := repo.CompleteTask(ctx, job.TaskID, job.TaskType, job.TenantID, resultJSON, time.Now()); err != nil {
		s.failAssist(ctx, job.TaskID, job.TaskType, job.TenantID, err)
		return
	}
	s.completeTemplateAssistAIPoints(ctx, job.TenantID, job.TaskID, result.Model)
}

func (s *TemplateService) executeOutlineTask(ctx context.Context, repo repository.TemplateAssistTaskRepository, job assistJob) {
	if job.OutlineRequest == nil {
		s.failAssist(ctx, job.TaskID, job.TaskType, job.TenantID, fmt.Errorf("missing outline request"))
		return
	}

	result, err := s.llm.Generate(ctx, llm.GenerateRequest{
		Prompt: buildOutlinePrompt(job.TemplateKey, job.TemplateName, *job.OutlineRequest, job.OutlinePrompt),
		ResponseFormat: &llm.ResponseFormat{
			Type:        llm.ResponseFormatTypeJSONObject,
			Name:        "article_outline",
			Description: prompts.OutlineResponseFormatDescription(),
		},
	}, nil)
	if err != nil {
		s.failAssist(ctx, job.TaskID, job.TaskType, job.TenantID, err)
		return
	}

	outline, err := decodeOutlineResult(result.Content)
	if err != nil {
		s.failAssist(ctx, job.TaskID, job.TaskType, job.TenantID, err)
		return
	}

	normalized := normalizeOutlineNodes(outline, 2)
	if len(normalized) == 0 {
		s.failAssist(ctx, job.TaskID, job.TaskType, job.TenantID, fmt.Errorf("outline result is empty"))
		return
	}

	resultJSON, err := json.Marshal(normalized)
	if err != nil {
		s.failAssist(ctx, job.TaskID, job.TaskType, job.TenantID, err)
		return
	}

	if err := repo.CompleteTask(ctx, job.TaskID, job.TaskType, job.TenantID, resultJSON, time.Now()); err != nil {
		s.failAssist(ctx, job.TaskID, job.TaskType, job.TenantID, err)
		return
	}
	s.completeTemplateAssistAIPoints(ctx, job.TenantID, job.TaskID, result.Model)
}

func (s *TemplateService) failAssist(ctx context.Context, taskID, taskType string, tenantID int64, err error) {
	repo := repository.NewTemplateAssistTaskRepository(s.pool)
	_ = repo.FailTask(ctx, taskID, taskType, tenantID, err.Error(), time.Now())
	if isTemplateAssistAIPointTask(taskType) {
		resourceType := "template_assist_task"
		resourceUID := taskID
		_ = RefundPendingAIPointsByResource(ctx, s.pool, s.cache, tenantID, resourceType, nil, &resourceUID, err.Error())
	}
}

func (s *TemplateService) reserveTemplateAssistAIPoints(
	ctx context.Context,
	tenantID int64,
	operatorID int64,
	templateID int64,
	taskID string,
	taskType string,
	meteredText string,
) (*AIPointReservation, error) {
	usageType := AIUsageTypeTemplateTitleGenerate
	fixedPoints := 0
	switch taskType {
	case templateAssistTaskTypeAnalyze:
		usageType = AIUsageTypeTemplateAnalyze
		fixedPoints = 1
	case templateAssistTaskTypeOutline:
		usageType = AIUsageTypeTemplateOutlineGenerate
	}
	resourceType := "template_assist_task"
	resourceUID := taskID
	return ReserveAIPoints(ctx, s.pool, s.cache, AIPointReserveInput{
		TenantID:     tenantID,
		OperatorID:   operatorID,
		UsageType:    usageType,
		ResourceType: &resourceType,
		ResourceID:   &templateID,
		ResourceUID:  &resourceUID,
		MeteredText:  meteredText,
		FixedPoints:  fixedPoints,
		Metadata: map[string]any{
			"template_id": templateID,
			"task_id":     taskID,
			"task_type":   taskType,
		},
	})
}

func (s *TemplateService) refundReservedAIPoints(ctx context.Context, tenantID, operatorID int64, reservation *AIPointReservation, errorMessage string) {
	if reservation == nil {
		return
	}
	_ = RefundAIPoints(ctx, s.pool, s.cache, tenantID, operatorID, *reservation, errorMessage)
}

func (s *TemplateService) completeTemplateAssistAIPoints(ctx context.Context, tenantID int64, taskID string, model string) {
	resourceType := "template_assist_task"
	resourceUID := taskID
	_ = CompletePendingAIPointsByResource(ctx, s.pool, tenantID, resourceType, nil, &resourceUID, model)
}

func isTemplateAssistAIPointTask(taskType string) bool {
	return taskType == templateAssistTaskTypeAnalyze ||
		taskType == templateAssistTaskTypeTitle ||
		taskType == templateAssistTaskTypeOutline
}

func normalizeAnalyzeTaskRequest(req AnalyzeTaskRequest) AnalyzeTaskRequest {
	req.Locale = strings.TrimSpace(req.Locale)
	if req.Locale == "" {
		req.Locale = "zh-CN"
	}
	req.BrandName = strings.TrimSpace(req.BrandName)
	req.Website = strings.TrimSpace(req.Website)
	req.ExistingKeywords = normalizeStringList(req.ExistingKeywords, 8)
	req.ExistingCompetitors = normalizeAssistCompetitors(req.ExistingCompetitors, 8)
	req.InputParams = normalizeAssistInputParams(req.InputParams)
	return req
}

func normalizeTitleTaskRequest(req TitleTaskRequest) TitleTaskRequest {
	req.Locale = strings.TrimSpace(req.Locale)
	if req.Locale == "" {
		req.Locale = "zh-CN"
	}
	req.BrandName = strings.TrimSpace(req.BrandName)
	req.Website = strings.TrimSpace(req.Website)
	req.BrandSummary = strings.TrimSpace(req.BrandSummary)
	req.Keywords = normalizeStringList(req.Keywords, 12)
	req.Competitors = normalizeAssistCompetitors(req.Competitors, 8)
	req.InputParams = normalizeAssistInputParams(req.InputParams)
	return req
}

func normalizeOutlineTaskRequest(req OutlineTaskRequest) OutlineTaskRequest {
	req.Locale = strings.TrimSpace(req.Locale)
	if req.Locale == "" {
		req.Locale = "zh-CN"
	}
	req.BrandName = strings.TrimSpace(req.BrandName)
	req.Website = strings.TrimSpace(req.Website)
	req.BrandSummary = strings.TrimSpace(req.BrandSummary)
	req.Title = strings.TrimSpace(req.Title)
	req.KeyPoints = strings.TrimSpace(req.KeyPoints)
	req.Keywords = normalizeStringList(req.Keywords, 12)
	req.Competitors = normalizeAssistCompetitors(req.Competitors, 8)
	req.OutlineSections = normalizeStringList(req.OutlineSections, 24)
	req.InputParams = normalizeAssistInputParams(req.InputParams)
	return req
}

func normalizeAssistInputParams(params map[string]interface{}) map[string]interface{} {
	if params == nil {
		return map[string]interface{}{}
	}
	for key, value := range params {
		if text, ok := value.(string); ok {
			params[key] = strings.TrimSpace(text)
		}
	}
	return params
}

func hasAnalyzeContext(req AnalyzeTaskRequest) bool {
	if req.BrandName != "" || req.Website != "" {
		return true
	}
	for _, value := range req.InputParams {
		switch typed := value.(type) {
		case string:
			if strings.TrimSpace(typed) != "" {
				return true
			}
		case []interface{}:
			if len(typed) > 0 {
				return true
			}
		case []string:
			if len(typed) > 0 {
				return true
			}
		case float64, float32, int, int32, int64:
			return true
		}
	}
	return len(req.ExistingKeywords) > 0 || len(req.ExistingCompetitors) > 0
}

func hasTitleContext(req TitleTaskRequest) bool {
	if req.BrandName != "" || req.Website != "" || req.BrandSummary != "" {
		return true
	}
	if len(req.Keywords) > 0 || len(req.Competitors) > 0 {
		return true
	}
	for _, value := range req.InputParams {
		switch typed := value.(type) {
		case string:
			if strings.TrimSpace(typed) != "" {
				return true
			}
		case []interface{}:
			if len(typed) > 0 {
				return true
			}
		case []string:
			if len(typed) > 0 {
				return true
			}
		case float64, float32, int, int32, int64:
			return true
		}
	}
	return false
}

func hasOutlineContext(req OutlineTaskRequest) bool {
	if req.Title == "" || len(req.OutlineSections) == 0 {
		return false
	}
	if req.BrandName != "" || req.Website != "" || req.BrandSummary != "" || req.KeyPoints != "" {
		return true
	}
	if len(req.Keywords) > 0 || len(req.Competitors) > 0 {
		return true
	}
	for _, value := range req.InputParams {
		switch typed := value.(type) {
		case string:
			if strings.TrimSpace(typed) != "" {
				return true
			}
		case []interface{}:
			if len(typed) > 0 {
				return true
			}
		case []string:
			if len(typed) > 0 {
				return true
			}
		case float64, float32, int, int32, int64:
			return true
		}
	}
	return true
}

func buildAnalyzePrompt(templateKey, templateName string, req AnalyzeTaskRequest, analyzePromptTemplate *string) string {
	contextPayload := analyzePromptParams(templateKey, templateName, req)

	if analyzePromptTemplate != nil && strings.TrimSpace(*analyzePromptTemplate) != "" {
		basePrompt := strings.TrimSpace(renderPromptTemplate(analyzePromptTemplate, contextPayload))
		if basePrompt != "" {
			contextJSON, _ := json.MarshalIndent(contextPayload, "", "  ")
			return prompts.TemplateContextWithJSONExample(basePrompt, string(contextJSON), prompts.AnalyzeOutputExample())
		}
	}

	contextJSON, _ := json.MarshalIndent(contextPayload, "", "  ")
	return prompts.AnalyzeFallbackPrompt(string(contextJSON))
}

func buildAnalyzeAIPointMeteredText(req AnalyzeTaskRequest) string {
	payload, _ := json.Marshal(analyzePromptParams("", "", req))
	return string(payload)
}

func buildTitlePrompt(templateKey, templateName string, req TitleTaskRequest, titlePromptTemplate *string) string {
	contextPayload := titlePromptParams(templateKey, templateName, req)
	if titlePromptTemplate != nil && strings.TrimSpace(*titlePromptTemplate) != "" {
		basePrompt := strings.TrimSpace(renderPromptTemplate(titlePromptTemplate, contextPayload))
		if basePrompt != "" {
			sections := []string{basePrompt}
			if contextBlock := buildPromptContext(contextPayload); contextBlock != "" {
				sections = append(sections, prompts.PromptContextSection(contextBlock))
			}
			sections = append(sections, prompts.TitleCustomOutputRequirementsSection())
			return strings.Join(sections, "\n\n")
		}
	}

	contextJSON, _ := json.MarshalIndent(contextPayload, "", "  ")
	return prompts.TitleFallbackPrompt(string(contextJSON))
}

func buildOutlinePrompt(templateKey, templateName string, req OutlineTaskRequest, outlinePromptTemplate *string) string {
	contextPayload := outlinePromptParams(templateKey, templateName, req)
	outputExample := prompts.OutlineOutputExample()

	if outlinePromptTemplate != nil && strings.TrimSpace(*outlinePromptTemplate) != "" {
		basePrompt := strings.TrimSpace(renderPromptTemplate(outlinePromptTemplate, contextPayload))
		if basePrompt != "" {
			sections := []string{basePrompt}
			if contextBlock := buildPromptContext(contextPayload); contextBlock != "" {
				sections = append(sections, prompts.PromptContextSection(contextBlock))
			}
			sections = append(sections, prompts.OutlineCustomOutputRequirementsSection())
			sections = append(sections, prompts.JSONOutputExampleSection(outputExample))
			return strings.Join(sections, "\n\n")
		}
	}

	contextJSON, _ := json.MarshalIndent(contextPayload, "", "  ")
	return prompts.OutlineFallbackPrompt(string(contextJSON))
}

func buildTitleAIPointMeteredText(req TitleTaskRequest) string {
	payload, _ := json.Marshal(titlePromptParams("", "", req))
	return string(payload)
}

func buildOutlineAIPointMeteredText(req OutlineTaskRequest) string {
	payload, _ := json.Marshal(outlinePromptParams("", "", req))
	return string(payload)
}

func analyzePromptParams(templateKey, templateName string, req AnalyzeTaskRequest) map[string]interface{} {
	return map[string]interface{}{
		"template_key":         templateKey,
		"template_name":        templateName,
		"locale":               req.Locale,
		"brand_name":           req.BrandName,
		"official_website":     req.Website,
		"input_params":         req.InputParams,
		"existing_keywords":    req.ExistingKeywords,
		"existing_competitors": req.ExistingCompetitors,
	}
}

func titlePromptParams(templateKey, templateName string, req TitleTaskRequest) map[string]interface{} {
	params := map[string]interface{}{
		"template_key":     templateKey,
		"template_name":    templateName,
		"locale":           req.Locale,
		"brand_name":       req.BrandName,
		"official_website": req.Website,
		"brand_summary":    req.BrandSummary,
		"input_params":     req.InputParams,
		"keywords":         req.Keywords,
		"competitors":      req.Competitors,
		"competitor_count": len(req.Competitors),
		"current_year":     time.Now().Year(),
	}
	mergePromptParams(params, req.InputParams)

	if len(req.Keywords) > 0 {
		params["primary_keyword"] = req.Keywords[0]
		params["keyword_count"] = len(req.Keywords)
	}
	if count, ok := req.InputParams["count"]; ok {
		params["count"] = count
	} else if len(req.Competitors) > 0 {
		params["count"] = len(req.Competitors)
	}
	if currentCount, ok := params["count"]; ok {
		params["top_count"] = currentCount
	}
	if len(req.Competitors) > 0 {
		names := make([]string, 0, len(req.Competitors))
		for _, competitor := range req.Competitors {
			if name := strings.TrimSpace(competitor.Name); name != "" {
				names = append(names, name)
			}
		}
		if len(names) > 0 {
			params["competitor_names"] = names
		}
	}

	return params
}

func outlinePromptParams(templateKey, templateName string, req OutlineTaskRequest) map[string]interface{} {
	params := map[string]interface{}{
		"template_key":     templateKey,
		"template_name":    templateName,
		"locale":           req.Locale,
		"title":            req.Title,
		"brand_name":       req.BrandName,
		"official_website": req.Website,
		"brand_summary":    req.BrandSummary,
		"input_params":     req.InputParams,
		"keywords":         req.Keywords,
		"competitors":      req.Competitors,
		"competitor_count": len(req.Competitors),
		"outline_sections": req.OutlineSections,
		"key_points":       req.KeyPoints,
		"current_year":     time.Now().Year(),
	}
	mergePromptParams(params, req.InputParams)

	if len(req.Keywords) > 0 {
		params["primary_keyword"] = req.Keywords[0]
		params["keyword_count"] = len(req.Keywords)
	}
	if count, ok := req.InputParams["count"]; ok {
		params["count"] = count
	} else if len(req.Competitors) > 0 {
		params["count"] = len(req.Competitors)
	}
	if currentCount, ok := params["count"]; ok {
		params["top_count"] = currentCount
	}
	if len(req.Competitors) > 0 {
		names := make([]string, 0, len(req.Competitors))
		for _, competitor := range req.Competitors {
			if name := strings.TrimSpace(competitor.Name); name != "" {
				names = append(names, name)
			}
		}
		if len(names) > 0 {
			params["competitor_names"] = names
		}
	}

	return params
}

func mergePromptParams(target map[string]interface{}, input map[string]interface{}) {
	for key, value := range input {
		if _, exists := target[key]; exists {
			continue
		}
		target[key] = value
	}
}

func extractAnalyzePromptTemplate(cardConfigJSON []byte) *string {
	return extractWizardPromptTemplate(cardConfigJSON, "analyze_prompt_template")
}

func extractTitlePromptTemplate(cardConfigJSON []byte) *string {
	return extractWizardPromptTemplate(cardConfigJSON, "title_prompt_template")
}

func extractOutlinePromptTemplate(cardConfigJSON []byte) *string {
	return extractWizardPromptTemplate(cardConfigJSON, "outline_prompt_template")
}

func extractWizardPromptTemplate(cardConfigJSON []byte, field string) *string {
	if len(cardConfigJSON) == 0 {
		return nil
	}

	var cardConfig map[string]interface{}
	if err := json.Unmarshal(cardConfigJSON, &cardConfig); err != nil {
		return nil
	}

	wizard, _ := cardConfig["wizard"].(map[string]interface{})
	if wizard == nil {
		return nil
	}

	if structure, _ := wizard["structure"].(map[string]interface{}); structure != nil {
		prompt, _ := structure[field].(string)
		prompt = strings.TrimSpace(prompt)
		if prompt != "" {
			return &prompt
		}
	}

	prompt, _ := wizard[field].(string)
	prompt = strings.TrimSpace(prompt)
	if prompt == "" {
		return nil
	}

	return &prompt
}

var jsonFencePattern = regexp.MustCompile("(?s)^```(?:json)?\\s*(.*?)\\s*```$")

func decodeAnalyzeResult(raw string) (*AnalyzeTaskResult, error) {
	cleaned := stripJSONFence(raw)

	var result AnalyzeTaskResult
	if err := json.Unmarshal([]byte(cleaned), &result); err != nil {
		return nil, fmt.Errorf("decode analyze result: %w", err)
	}
	return &result, nil
}

func decodeTitleResult(raw string) ([]string, error) {
	cleaned := stripJSONFence(raw)

	var result []string
	if err := json.Unmarshal([]byte(cleaned), &result); err == nil {
		return result, nil
	}

	var wrapped struct {
		Titles []string `json:"titles"`
	}
	if err := json.Unmarshal([]byte(cleaned), &wrapped); err != nil {
		return nil, fmt.Errorf("decode title result: %w", err)
	}
	return wrapped.Titles, nil
}

func decodeOutlineResult(raw string) ([]OutlineNode, error) {
	var lastErr error
	for _, candidate := range extractJSONCandidates(raw) {
		var result []OutlineNode
		if err := json.Unmarshal([]byte(candidate), &result); err == nil {
			return result, nil
		} else {
			lastErr = err
		}

		var wrapped struct {
			Result   []OutlineNode `json:"result"`
			Outline  []OutlineNode `json:"outline"`
			Items    []OutlineNode `json:"items"`
			Data     []OutlineNode `json:"data"`
			Sections []OutlineNode `json:"sections"`
		}
		if err := json.Unmarshal([]byte(candidate), &wrapped); err != nil {
			lastErr = err
			continue
		}
		switch {
		case len(wrapped.Result) > 0:
			return wrapped.Result, nil
		case len(wrapped.Outline) > 0:
			return wrapped.Outline, nil
		case len(wrapped.Items) > 0:
			return wrapped.Items, nil
		case len(wrapped.Data) > 0:
			return wrapped.Data, nil
		case len(wrapped.Sections) > 0:
			return wrapped.Sections, nil
		default:
			lastErr = fmt.Errorf("outline object does not contain a supported outline field")
		}
	}
	if lastErr == nil {
		lastErr = fmt.Errorf("empty content")
	}
	return nil, fmt.Errorf("decode outline result: %w", lastErr)
}

func stripJSONFence(raw string) string {
	cleaned := strings.TrimSpace(raw)
	if matches := jsonFencePattern.FindStringSubmatch(cleaned); len(matches) == 2 {
		cleaned = strings.TrimSpace(matches[1])
	}
	return cleaned
}

func extractJSONCandidates(raw string) []string {
	cleaned := stripJSONFence(raw)
	if cleaned == "" {
		return nil
	}

	candidates := make([]string, 0, 8)
	seen := make(map[string]struct{}, 8)
	addCandidate := func(value string) {
		value = strings.TrimSpace(value)
		if value == "" {
			return
		}
		if _, exists := seen[value]; exists {
			return
		}
		seen[value] = struct{}{}
		candidates = append(candidates, value)
	}

	addCandidate(cleaned)
	for i := 0; i < len(cleaned); i++ {
		switch cleaned[i] {
		case '{', '[':
			if fragment, ok := extractBalancedJSONFragment(cleaned[i:]); ok {
				addCandidate(fragment)
			}
		}
	}

	return candidates
}

func extractBalancedJSONFragment(input string) (string, bool) {
	if input == "" {
		return "", false
	}

	var open, close byte
	switch input[0] {
	case '{':
		open = '{'
		close = '}'
	case '[':
		open = '['
		close = ']'
	default:
		return "", false
	}

	depth := 0
	inString := false
	escaped := false

	for i := 0; i < len(input); i++ {
		ch := input[i]
		if inString {
			if escaped {
				escaped = false
				continue
			}
			switch ch {
			case '\\':
				escaped = true
			case '"':
				inString = false
			}
			continue
		}

		switch ch {
		case '"':
			inString = true
		case open:
			depth += 1
		case close:
			depth -= 1
			if depth == 0 {
				return input[:i+1], true
			}
		}
	}

	return "", false
}

func normalizeAnalyzeResult(result AnalyzeTaskResult) AnalyzeTaskResult {
	result.BrandSummary = strings.TrimSpace(result.BrandSummary)
	result.Keywords = normalizeStringList(result.Keywords, 10)
	result.Competitors = normalizeAssistCompetitors(result.Competitors, 6)
	return result
}

func normalizeOutlineNodes(nodes []OutlineNode, depth int) []OutlineNode {
	if len(nodes) == 0 || depth <= 0 {
		return []OutlineNode{}
	}

	items := make([]OutlineNode, 0, len(nodes))
	for _, node := range nodes {
		outline := strings.TrimSpace(node.Outline)
		if outline == "" {
			continue
		}
		item := OutlineNode{Outline: outline}
		if depth > 1 && len(node.Children) > 0 {
			item.Children = normalizeOutlineNodes(node.Children, depth-1)
		}
		items = append(items, item)
	}
	return items
}

func normalizeStringList(values []string, max int) []string {
	if len(values) == 0 {
		return []string{}
	}

	seen := make(map[string]struct{}, len(values))
	items := make([]string, 0, len(values))
	for _, value := range values {
		trimmed := strings.TrimSpace(value)
		if trimmed == "" {
			continue
		}
		key := strings.ToLower(trimmed)
		if _, ok := seen[key]; ok {
			continue
		}
		seen[key] = struct{}{}
		items = append(items, trimmed)
		if max > 0 && len(items) >= max {
			break
		}
	}
	return items
}

func normalizeAssistCompetitors(values []AssistCompetitor, max int) []AssistCompetitor {
	if len(values) == 0 {
		return []AssistCompetitor{}
	}

	seen := make(map[string]struct{}, len(values))
	items := make([]AssistCompetitor, 0, len(values))
	for _, value := range values {
		competitor := AssistCompetitor{
			Name:        strings.TrimSpace(value.Name),
			Website:     strings.TrimSpace(value.Website),
			Description: strings.TrimSpace(value.Description),
		}
		if competitor.Name == "" && competitor.Website == "" {
			continue
		}

		identity := strings.ToLower(strings.TrimSpace(competitor.Website))
		if identity == "" {
			identity = strings.ToLower(strings.TrimSpace(competitor.Name))
		}
		if identity == "" {
			continue
		}
		if _, ok := seen[identity]; ok {
			continue
		}
		seen[identity] = struct{}{}
		items = append(items, competitor)
		if max > 0 && len(items) >= max {
			break
		}
	}
	return items
}

func assistTaskMessage(status string) string {
	switch status {
	case "queued":
		return "pending"
	case "running":
		return "running"
	case "completed":
		return "success"
	case "failed":
		return "failed"
	default:
		return status
	}
}