package transport

import (
	"strconv"
	"strings"

	"github.com/gin-gonic/gin"
	"github.com/google/uuid"

	"github.com/geo-platform/tenant-api/internal/bootstrap"
	"github.com/geo-platform/tenant-api/internal/shared/response"
	"github.com/geo-platform/tenant-api/internal/tenant/app"
)

type MonitoringHandler struct {
	svc *app.MonitoringService
}

type monitoringCollectNowRequest struct {
	KeywordID            *int64   `json:"keyword_id"`
	QuestionID           *int64   `json:"question_id"`
	PlatformIDs          []string `json:"platform_ids"`
	Preempt              *bool    `json:"preempt"`
	WaitForFirstDispatch *bool    `json:"wait_for_first_dispatch"`
	TargetClientID       *string  `json:"target_client_id"`
}

type monitoringMarkedArticleRequest struct {
	ArticleTitle string `json:"article_title"`
	OriginalURL  string `json:"original_url"`
	BrandID      *int64 `json:"brand_id"`
}

func NewMonitoringHandler(a *bootstrap.App) *MonitoringHandler {
	return &MonitoringHandler{
		svc: a.MonitoringService,
	}
}

func (h *MonitoringHandler) DashboardComposite(c *gin.Context) {
	brandID, err := parseOptionalInt64(c.Query("brand_id"))
	if err != nil {
		response.Error(c, response.ErrBadRequest(40031, "invalid_brand_id", "brand_id must be a number"))
		return
	}

	keywordID, err := parseOptionalInt64Pointer(c.Query("keyword_id"))
	if err != nil {
		response.Error(c, response.ErrBadRequest(40031, "invalid_keyword_id", "keyword_id must be a number"))
		return
	}

	questionID, err := parseOptionalInt64Pointer(c.Query("question_id"))
	if err != nil {
		response.Error(c, response.ErrBadRequest(40031, "invalid_question_id", "question_id must be a number"))
		return
	}

	days, err := parseOptionalInt(c.Query("days"))
	if err != nil {
		response.Error(c, response.ErrBadRequest(40031, "invalid_days", "days must be a number"))
		return
	}

	aiPlatformID := parseOptionalStringPointer(c.Query("ai_platform_id"))
	hotQuestionPage, err := parseMonitoringPageRequest(c, "hot_questions", true)
	if err != nil {
		response.Error(c, err)
		return
	}

	data, svcErr := h.svc.DashboardComposite(c.Request.Context(), brandID, keywordID, questionID, days, c.Query("business_date"), aiPlatformID, hotQuestionPage)
	if svcErr != nil {
		response.Error(c, svcErr)
		return
	}
	response.Success(c, data)
}

func (h *MonitoringHandler) CitationSummary(c *gin.Context) {
	days, err := parseOptionalInt(c.Query("days"))
	if err != nil {
		response.Error(c, response.ErrBadRequest(40031, "invalid_days", "days must be a number"))
		return
	}

	brandID, err := parseOptionalInt64(c.Query("brand_id"))
	if err != nil {
		response.Error(c, response.ErrBadRequest(40031, "invalid_brand_id", "brand_id must be a number"))
		return
	}

	keywordID, err := parseOptionalInt64Pointer(c.Query("keyword_id"))
	if err != nil {
		response.Error(c, response.ErrBadRequest(40031, "invalid_keyword_id", "keyword_id must be a number"))
		return
	}

	questionID, err := parseOptionalInt64Pointer(c.Query("question_id"))
	if err != nil {
		response.Error(c, response.ErrBadRequest(40031, "invalid_question_id", "question_id must be a number"))
		return
	}

	aiPlatformID := parseOptionalStringPointer(c.Query("ai_platform_id"))
	citedArticlePage, err := parseMonitoringPageRequest(c, "cited_articles", false)
	if err != nil {
		response.Error(c, err)
		return
	}

	data, svcErr := h.svc.CitationSummary(c.Request.Context(), days, brandID, keywordID, questionID, c.Query("business_date"), aiPlatformID, citedArticlePage)
	if svcErr != nil {
		response.Error(c, svcErr)
		return
	}
	response.Success(c, data)
}

func (h *MonitoringHandler) QuestionDetail(c *gin.Context) {
	brandID, err := strconv.ParseInt(c.Param("brand_id"), 10, 64)
	if err != nil {
		response.Error(c, response.ErrBadRequest(40031, "invalid_brand_id", "brand_id must be a number"))
		return
	}

	questionID, err := strconv.ParseInt(c.Param("question_id"), 10, 64)
	if err != nil {
		response.Error(c, response.ErrBadRequest(40031, "invalid_question_id", "question_id must be a number"))
		return
	}

	aiPlatformID := parseOptionalStringPointer(c.Query("ai_platform_id"))

	data, svcErr := h.svc.QuestionDetail(
		c.Request.Context(),
		brandID,
		questionID,
		c.Query("date_from"),
		c.Query("date_to"),
		c.Query("question_hash"),
		aiPlatformID,
	)
	if svcErr != nil {
		response.Error(c, svcErr)
		return
	}
	response.Success(c, data)
}

func (h *MonitoringHandler) CollectNow(c *gin.Context) {
	brandID, err := strconv.ParseInt(c.Param("brand_id"), 10, 64)
	if err != nil {
		response.Error(c, response.ErrBadRequest(40031, "invalid_brand_id", "brand_id must be a number"))
		return
	}

	var req monitoringCollectNowRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.Error(c, response.ErrBadRequest(40031, "invalid_collect_now_request", "collect-now request is invalid"))
		return
	}

	var targetClientID *uuid.UUID
	if req.TargetClientID != nil && strings.TrimSpace(*req.TargetClientID) != "" {
		parsed, parseErr := uuid.Parse(strings.TrimSpace(*req.TargetClientID))
		if parseErr != nil {
			response.Error(c, response.ErrBadRequest(40031, "invalid_target_client_id", "target_client_id must be a uuid"))
			return
		}
		targetClientID = &parsed
	}

	data, svcErr := h.svc.CollectNow(c.Request.Context(), brandID, req.KeywordID, req.QuestionID, app.MonitoringCollectNowOptions{
		PlatformIDs:          req.PlatformIDs,
		Preempt:              req.Preempt == nil || *req.Preempt,
		WaitForFirstDispatch: req.WaitForFirstDispatch != nil && *req.WaitForFirstDispatch,
		TargetClientID:       targetClientID,
	})
	if svcErr != nil {
		response.Error(c, svcErr)
		return
	}
	response.Success(c, data)
}

func (h *MonitoringHandler) ListMarkedArticles(c *gin.Context) {
	page, err := parseOptionalInt(c.Query("page"))
	if err != nil {
		response.Error(c, response.ErrBadRequest(40031, "invalid_page", "page must be a number"))
		return
	}
	pageSize, err := parseOptionalInt(c.Query("page_size"))
	if err != nil {
		response.Error(c, response.ErrBadRequest(40031, "invalid_page_size", "page_size must be a number"))
		return
	}
	data, svcErr := h.svc.ListMarkedArticles(c.Request.Context(), app.MonitoringMarkedArticleListParams{
		Domain:      c.Query("domain"),
		Title:       c.Query("title"),
		CreatedFrom: c.Query("created_from"),
		CreatedTo:   c.Query("created_to"),
		Page:        page,
		PageSize:    pageSize,
	})
	if svcErr != nil {
		response.Error(c, svcErr)
		return
	}
	response.Success(c, data)
}

func (h *MonitoringHandler) CreateMarkedArticle(c *gin.Context) {
	var req monitoringMarkedArticleRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.Error(c, response.ErrBadRequest(40031, "invalid_marked_article_request", "marked article request is invalid"))
		return
	}
	data, svcErr := h.svc.CreateMarkedArticle(c.Request.Context(), app.MonitoringMarkedArticleRequest{
		ArticleTitle: req.ArticleTitle,
		OriginalURL:  req.OriginalURL,
		BrandID:      req.BrandID,
	})
	if svcErr != nil {
		response.Error(c, svcErr)
		return
	}
	response.Success(c, data)
}

func (h *MonitoringHandler) UpdateMarkedArticle(c *gin.Context) {
	id, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil {
		response.Error(c, response.ErrBadRequest(40031, "invalid_marked_article_id", "marked article id must be a number"))
		return
	}
	var req monitoringMarkedArticleRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.Error(c, response.ErrBadRequest(40031, "invalid_marked_article_request", "marked article request is invalid"))
		return
	}
	data, svcErr := h.svc.UpdateMarkedArticle(c.Request.Context(), id, app.MonitoringMarkedArticleRequest{
		ArticleTitle: req.ArticleTitle,
		OriginalURL:  req.OriginalURL,
		BrandID:      req.BrandID,
	})
	if svcErr != nil {
		response.Error(c, svcErr)
		return
	}
	response.Success(c, data)
}

func (h *MonitoringHandler) DeleteMarkedArticle(c *gin.Context) {
	id, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil {
		response.Error(c, response.ErrBadRequest(40031, "invalid_marked_article_id", "marked article id must be a number"))
		return
	}
	if svcErr := h.svc.DeleteMarkedArticle(c.Request.Context(), id); svcErr != nil {
		response.Error(c, svcErr)
		return
	}
	response.Success(c, gin.H{"ok": true})
}

func parseOptionalInt64(raw string) (int64, error) {
	if raw == "" {
		return 0, nil
	}
	return strconv.ParseInt(raw, 10, 64)
}

func parseOptionalInt64Pointer(raw string) (*int64, error) {
	if raw == "" {
		return nil, nil
	}
	value, err := strconv.ParseInt(raw, 10, 64)
	if err != nil {
		return nil, err
	}
	return &value, nil
}

func parseOptionalInt(raw string) (int, error) {
	if raw == "" {
		return 0, nil
	}
	return strconv.Atoi(raw)
}

func parseOptionalStringPointer(raw string) *string {
	trimmed := strings.TrimSpace(raw)
	if trimmed == "" {
		return nil
	}
	value := trimmed
	return &value
}

func parseMonitoringPageRequest(c *gin.Context, prefix string, includeQuery bool) (app.MonitoringPageRequest, error) {
	req := app.MonitoringPageRequest{}
	if raw := c.Query(prefix + "_page"); raw != "" {
		value, err := strconv.Atoi(raw)
		if err != nil || value <= 0 {
			return req, response.ErrBadRequest(40031, "invalid_page", prefix+"_page must be a positive number")
		}
		req.Page = value
	}
	if raw := c.Query(prefix + "_page_size"); raw != "" {
		value, err := strconv.Atoi(raw)
		if err != nil || value <= 0 {
			return req, response.ErrBadRequest(40031, "invalid_page_size", prefix+"_page_size must be a positive number")
		}
		req.PageSize = value
	}
	if includeQuery {
		req.Query = strings.TrimSpace(c.Query(prefix + "_q"))
	}
	return req, nil
}