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"`
	PlatformIDs          []string `json:"platform_ids"`
	Preempt              *bool    `json:"preempt"`
	WaitForFirstDispatch *bool    `json:"wait_for_first_dispatch"`
	TargetClientID       *string  `json:"target_client_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
	}

	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"))

	data, svcErr := h.svc.DashboardComposite(c.Request.Context(), brandID, keywordID, days, c.Query("business_date"), aiPlatformID)
	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
	}

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

	data, svcErr := h.svc.CitationSummary(c.Request.Context(), days, brandID, keywordID, c.Query("business_date"), aiPlatformID)
	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, 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 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
}