package transport

import (
	"errors"
	"io"
	"strconv"
	"strings"

	"github.com/gin-gonic/gin"

	"github.com/geo-platform/tenant-api/internal/bootstrap"
	"github.com/geo-platform/tenant-api/internal/shared/auth"
	"github.com/geo-platform/tenant-api/internal/shared/response"
	tenantcompliance "github.com/geo-platform/tenant-api/internal/tenant/compliance"
)

type ComplianceHandler struct {
	svc *tenantcompliance.Service
}

func NewComplianceHandler(a *bootstrap.App) *ComplianceHandler {
	return &ComplianceHandler{
		svc: tenantcompliance.NewService(a.DB, a.ConfigStore, a.Logger).WithRabbitMQ(a.RabbitMQ).WithLLM(a.LLM),
	}
}

type complianceCheckPlainRequest struct {
	Title           string   `json:"title"`
	Plaintext       string   `json:"plaintext" binding:"required"`
	TargetPlatforms []string `json:"target_platforms"`
}

type complianceCheckArticleRequest struct {
	ArticleVersionID *int64   `json:"article_version_id"`
	Title            *string  `json:"title"`
	Plaintext        *string  `json:"plaintext"`
	TargetPlatforms  []string `json:"target_platforms"`
	TriggerSource    string   `json:"trigger_source"`
}

type complianceCreateAckRequest struct {
	AcknowledgedViolationIDs []int64 `json:"acknowledged_violation_ids" binding:"required"`
}

type complianceCreateManualReviewRequest struct {
	CheckRecordID int64  `json:"check_record_id" binding:"required"`
	Note          string `json:"note" binding:"required"`
}

type complianceCancelManualReviewRequest struct {
	Reason string `json:"reason"`
}

func (h *ComplianceHandler) RuntimeStatus(c *gin.Context) {
	actor := auth.MustActor(c.Request.Context())
	data, err := h.svc.RuntimeStatus(c.Request.Context(), actor.TenantID)
	if err != nil {
		response.Error(c, err)
		return
	}
	response.Success(c, data)
}

func (h *ComplianceHandler) CheckPlain(c *gin.Context) {
	var req complianceCheckPlainRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.Error(c, response.ErrBadRequest(40001, "invalid_params", err.Error()))
		return
	}
	actor := auth.MustActor(c.Request.Context())
	data, err := h.svc.CheckPlain(c.Request.Context(), tenantcompliance.CheckPlainRequest{
		TenantID:        actor.TenantID,
		ActorID:         actor.UserID,
		Title:           req.Title,
		Plaintext:       req.Plaintext,
		TargetPlatforms: req.TargetPlatforms,
	})
	if err != nil {
		response.Error(c, err)
		return
	}
	response.Success(c, data)
}

func (h *ComplianceHandler) CreateAck(c *gin.Context) {
	recordID, ok := parseComplianceInt64Param(c, "id", "check record id")
	if !ok {
		return
	}
	var req complianceCreateAckRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.Error(c, response.ErrBadRequest(40001, "invalid_params", err.Error()))
		return
	}
	actor := auth.MustActor(c.Request.Context())
	data, err := h.svc.CreateAck(c.Request.Context(), actor.TenantID, recordID, actor.UserID, req.AcknowledgedViolationIDs)
	if err != nil {
		response.Error(c, err)
		return
	}
	response.SuccessWithStatus(c, 201, data)
}

func (h *ComplianceHandler) CheckArticle(c *gin.Context) {
	articleID, ok := parseComplianceInt64Param(c, "id", "article id")
	if !ok {
		return
	}
	var req complianceCheckArticleRequest
	if err := c.ShouldBindJSON(&req); err != nil && !errors.Is(err, io.EOF) {
		response.Error(c, response.ErrBadRequest(40001, "invalid_params", err.Error()))
		return
	}
	actor := auth.MustActor(c.Request.Context())
	data, err := h.svc.CheckArticle(c.Request.Context(), tenantcompliance.CheckArticleRequest{
		TenantID:         actor.TenantID,
		ArticleID:        articleID,
		ArticleVersionID: req.ArticleVersionID,
		ActorID:          actor.UserID,
		Title:            req.Title,
		Plaintext:        req.Plaintext,
		TargetPlatforms:  req.TargetPlatforms,
		TriggerSource:    req.TriggerSource,
	})
	if err != nil {
		response.Error(c, err)
		return
	}
	response.Success(c, data)
}

func (h *ComplianceHandler) LatestCheck(c *gin.Context) {
	articleID, ok := parseComplianceInt64Param(c, "id", "article id")
	if !ok {
		return
	}
	actor := auth.MustActor(c.Request.Context())
	data, err := h.svc.LatestCheck(c.Request.Context(), actor.TenantID, articleID)
	if err != nil {
		response.Error(c, err)
		return
	}
	response.Success(c, data)
}

func (h *ComplianceHandler) SubmitManualReview(c *gin.Context) {
	articleID, ok := parseComplianceInt64Param(c, "id", "article id")
	if !ok {
		return
	}
	var req complianceCreateManualReviewRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.Error(c, response.ErrBadRequest(40001, "invalid_params", err.Error()))
		return
	}
	actor := auth.MustActor(c.Request.Context())
	data, err := h.svc.SubmitManualReview(c.Request.Context(), tenantcompliance.CreateManualReviewRequest{
		TenantID:      actor.TenantID,
		ArticleID:     articleID,
		ActorID:       actor.UserID,
		CheckRecordID: req.CheckRecordID,
		Note:          req.Note,
	})
	if err != nil {
		response.Error(c, err)
		return
	}
	response.SuccessWithStatus(c, 201, data)
}

func (h *ComplianceHandler) LatestManualReview(c *gin.Context) {
	articleID, ok := parseComplianceInt64Param(c, "id", "article id")
	if !ok {
		return
	}
	versionID, ok := optionalComplianceInt64Query(c, "article_version_id")
	if !ok {
		return
	}
	actor := auth.MustActor(c.Request.Context())
	data, err := h.svc.LatestManualReview(c.Request.Context(), actor.TenantID, articleID, versionID)
	if err != nil {
		response.Error(c, err)
		return
	}
	response.Success(c, data)
}

func (h *ComplianceHandler) CancelManualReview(c *gin.Context) {
	articleID, ok := parseComplianceInt64Param(c, "id", "article id")
	if !ok {
		return
	}
	reviewID, ok := parseComplianceInt64Param(c, "review_id", "manual review id")
	if !ok {
		return
	}
	var req complianceCancelManualReviewRequest
	if err := c.ShouldBindJSON(&req); err != nil && !errors.Is(err, io.EOF) {
		response.Error(c, response.ErrBadRequest(40001, "invalid_params", err.Error()))
		return
	}
	actor := auth.MustActor(c.Request.Context())
	data, err := h.svc.CancelManualReview(c.Request.Context(), tenantcompliance.CancelManualReviewRequest{
		TenantID:  actor.TenantID,
		ArticleID: articleID,
		ActorID:   actor.UserID,
		ReviewID:  reviewID,
		Reason:    req.Reason,
	})
	if err != nil {
		response.Error(c, err)
		return
	}
	response.Success(c, data)
}

func parseComplianceInt64Param(c *gin.Context, name, label string) (int64, bool) {
	value, err := strconv.ParseInt(strings.TrimSpace(c.Param(name)), 10, 64)
	if err != nil || value <= 0 {
		response.Error(c, response.ErrBadRequest(40001, "invalid_id", label+" must be a positive integer"))
		return 0, false
	}
	return value, true
}

func optionalComplianceInt64Query(c *gin.Context, name string) (*int64, bool) {
	raw := strings.TrimSpace(c.Query(name))
	if raw == "" {
		return nil, true
	}
	value, err := strconv.ParseInt(raw, 10, 64)
	if err != nil || value <= 0 {
		response.Error(c, response.ErrBadRequest(40001, "invalid_params", name+" must be a positive integer"))
		return nil, false
	}
	return &value, true
}