package routes

import (
	"bssapp-backend/queries"
	"bssapp-backend/utils"
	"context"
	"database/sql"
	"encoding/json"
	"net/http"
	"strconv"
	"strings"
	"time"
)

func GetProductPerformanceHandler(pg *sql.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json; charset=utf-8")
		traceID := utils.TraceIDFromRequest(r)
		ctx, cancel := context.WithTimeout(utils.ContextWithTraceID(r.Context(), traceID), 60*time.Second)
		defer cancel()

		f := queries.ProductPerformanceFilters{
			Search:      strings.TrimSpace(r.URL.Query().Get("q")),
			ProductCode: strings.TrimSpace(r.URL.Query().Get("product_code")),
			MarketKey:   strings.TrimSpace(r.URL.Query().Get("market_key")),
			Kategori:    strings.TrimSpace(r.URL.Query().Get("kategori")),
			Seri:        strings.TrimSpace(r.URL.Query().Get("seri")),
			Bucket:      strings.TrimSpace(r.URL.Query().Get("bucket")),
			SortBy:      strings.TrimSpace(r.URL.Query().Get("sort_by")),
			Descending:  boolQuery(r, "descending", true),
			Limit:       intQuery(r, "limit", 100),
			Page:        intQuery(r, "page", 1),
		}
		rows, total, err := queries.ListProductPerformance(ctx, pg, f)
		if err != nil {
			http.Error(w, "urun performans listesi alinamadi: "+err.Error(), http.StatusInternalServerError)
			return
		}
		w.Header().Set("X-Total-Count", strconv.Itoa(total))
		_ = json.NewEncoder(w).Encode(map[string]any{
			"rows":        rows,
			"total_count": total,
			"page":        f.Page,
			"limit":       f.Limit,
		})
	}
}

func GetProductPerformanceSalesDetailsHandler(pg *sql.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json; charset=utf-8")
		ctx, cancel := context.WithTimeout(r.Context(), 30*time.Second)
		defer cancel()
		rows, err := queries.ListProductPerformanceSalesDetails(
			ctx,
			pg,
			strings.TrimSpace(r.URL.Query().Get("product_code")),
			strings.TrimSpace(r.URL.Query().Get("color_code")),
			strings.TrimSpace(r.URL.Query().Get("yaka_kodu")),
			intQuery(r, "limit", 100),
		)
		if err != nil {
			http.Error(w, "urun satis detayi alinamadi: "+err.Error(), http.StatusInternalServerError)
			return
		}
		_ = json.NewEncoder(w).Encode(rows)
	}
}

func GetProductPerformanceStockSizesHandler() http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json; charset=utf-8")
		ctx, cancel := context.WithTimeout(r.Context(), 60*time.Second)
		defer cancel()
		rows, err := queries.ListProductPerformanceStockSizes(
			ctx,
			strings.TrimSpace(r.URL.Query().Get("product_code")),
			strings.TrimSpace(r.URL.Query().Get("color_code")),
			strings.TrimSpace(r.URL.Query().Get("yaka_kodu")),
		)
		if err != nil {
			http.Error(w, "urun beden stok detayi alinamadi: "+err.Error(), http.StatusInternalServerError)
			return
		}
		_ = json.NewEncoder(w).Encode(rows)
	}
}

func GetProductPerformanceSummaryHandler(pg *sql.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json; charset=utf-8")
		traceID := utils.TraceIDFromRequest(r)
		ctx, cancel := context.WithTimeout(utils.ContextWithTraceID(r.Context(), traceID), 30*time.Second)
		defer cancel()

		summary, err := queries.GetProductPerformanceSummary(ctx, pg)
		if err != nil {
			http.Error(w, "urun performans ozeti alinamadi: "+err.Error(), http.StatusInternalServerError)
			return
		}
		_ = json.NewEncoder(w).Encode(summary)
	}
}

func GetProductPerformanceGeneralHandler(pg *sql.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json; charset=utf-8")
		traceID := utils.TraceIDFromRequest(r)
		ctx, cancel := context.WithTimeout(utils.ContextWithTraceID(r.Context(), traceID), 60*time.Second)
		defer cancel()

		rows, err := queries.ListProductPerformanceGeneral(ctx, pg, intQuery(r, "limit", 500))
		if err != nil {
			http.Error(w, "genel urun performans KPI alinamadi: "+err.Error(), http.StatusInternalServerError)
			return
		}
		_ = json.NewEncoder(w).Encode(rows)
	}
}

func GetProductPerformanceOrdersHandler(pg *sql.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json; charset=utf-8")
		traceID := utils.TraceIDFromRequest(r)
		ctx, cancel := context.WithTimeout(utils.ContextWithTraceID(r.Context(), traceID), 90*time.Second)
		defer cancel()

		rows, err := queries.ListProductPerformanceOrderAnalysis(ctx, pg, intQuery(r, "limit", 500))
		if err != nil {
			http.Error(w, "siparis analiz verisi alinamadi: "+err.Error(), http.StatusInternalServerError)
			return
		}
		_ = json.NewEncoder(w).Encode(rows)
	}
}

func GetProductPerformanceOrderGroupsHandler(pg *sql.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json; charset=utf-8")
		traceID := utils.TraceIDFromRequest(r)
		ctx, cancel := context.WithTimeout(utils.ContextWithTraceID(r.Context(), traceID), 90*time.Second)
		defer cancel()

		rows, err := queries.ListProductPerformanceOrderGroups(
			ctx,
			pg,
			strings.TrimSpace(r.URL.Query().Get("breakdown")),
			intQuery(r, "limit", 500),
		)
		if err != nil {
			http.Error(w, "siparis grup analiz verisi alinamadi: "+err.Error(), http.StatusInternalServerError)
			return
		}
		_ = json.NewEncoder(w).Encode(rows)
	}
}

func GetProductPerformanceOrderProductCustomersHandler(pg *sql.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json; charset=utf-8")
		traceID := utils.TraceIDFromRequest(r)
		ctx, cancel := context.WithTimeout(utils.ContextWithTraceID(r.Context(), traceID), 90*time.Second)
		defer cancel()

		rows, err := queries.ListProductPerformanceOrderProductCustomers(ctx, pg, intQuery(r, "limit", 500))
		if err != nil {
			http.Error(w, "urun musteri siparis analiz verisi alinamadi: "+err.Error(), http.StatusInternalServerError)
			return
		}
		_ = json.NewEncoder(w).Encode(rows)
	}
}

func GetProductPerformanceOrderMarketDetailsHandler(pg *sql.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json; charset=utf-8")
		traceID := utils.TraceIDFromRequest(r)
		ctx, cancel := context.WithTimeout(utils.ContextWithTraceID(r.Context(), traceID), 90*time.Second)
		defer cancel()

		rows, err := queries.ListProductPerformanceOrderMarketDetails(ctx, pg, intQuery(r, "limit", 800))
		if err != nil {
			http.Error(w, "piyasa siparis detay analiz verisi alinamadi: "+err.Error(), http.StatusInternalServerError)
			return
		}
		_ = json.NewEncoder(w).Encode(rows)
	}
}

func GetProductPerformanceMarketsHandler(pg *sql.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json; charset=utf-8")
		traceID := utils.TraceIDFromRequest(r)
		ctx, cancel := context.WithTimeout(utils.ContextWithTraceID(r.Context(), traceID), 30*time.Second)
		defer cancel()

		rows, err := queries.ListProductPerformanceMarkets(ctx, pg, intQuery(r, "limit", 100))
		if err != nil {
			http.Error(w, "piyasa performans ozeti alinamadi: "+err.Error(), http.StatusInternalServerError)
			return
		}
		_ = json.NewEncoder(w).Encode(rows)
	}
}

func GetProductPerformanceCountriesHandler(pg *sql.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json; charset=utf-8")
		traceID := utils.TraceIDFromRequest(r)
		ctx, cancel := context.WithTimeout(utils.ContextWithTraceID(r.Context(), traceID), 30*time.Second)
		defer cancel()

		rows, err := queries.ListProductPerformanceCountries(ctx, pg, intQuery(r, "limit", 100))
		if err != nil {
			http.Error(w, "ulke performans ozeti alinamadi: "+err.Error(), http.StatusInternalServerError)
			return
		}
		_ = json.NewEncoder(w).Encode(rows)
	}
}

func GetProductPerformanceCustomersHandler(pg *sql.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json; charset=utf-8")
		traceID := utils.TraceIDFromRequest(r)
		ctx, cancel := context.WithTimeout(utils.ContextWithTraceID(r.Context(), traceID), 30*time.Second)
		defer cancel()

		rows, err := queries.ListProductPerformanceCustomers(
			ctx,
			pg,
			strings.TrimSpace(r.URL.Query().Get("breakdown")),
			intQuery(r, "limit", 100),
		)
		if err != nil {
			http.Error(w, "musteri performans kirilimi alinamadi: "+err.Error(), http.StatusInternalServerError)
			return
		}
		_ = json.NewEncoder(w).Encode(rows)
	}
}

type productPerformanceRefreshPayload struct {
	Mode          string `json:"mode"`
	Stage         string `json:"stage"`
	ResumeAfter   int    `json:"resume_after"`
	SkipDelete    bool   `json:"skip_delete"`
	ProductPrefix string `json:"product_prefix"`
	StartDate     string `json:"start_date"`
	EndDate       string `json:"end_date"`
}

func PostProductPerformanceRefreshHandler(pg *sql.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json; charset=utf-8")
		var payload productPerformanceRefreshPayload
		if err := json.NewDecoder(r.Body).Decode(&payload); err != nil {
			http.Error(w, "invalid payload", http.StatusBadRequest)
			return
		}
		now := time.Now()
		startDate := parseDateOrZero(payload.StartDate)
		endDate := parseDateOrZero(payload.EndDate)
		if endDate.IsZero() {
			endDate = now
		}
		ctx, cancel := context.WithTimeout(r.Context(), 4*time.Hour)
		defer cancel()
		result, err := queries.RefreshProductPerformance(ctx, pg, queries.ProductPerformanceRefreshRequest{
			Mode:          payload.Mode,
			Stage:         payload.Stage,
			ResumeAfter:   payload.ResumeAfter,
			SkipDelete:    payload.SkipDelete,
			ProductPrefix: payload.ProductPrefix,
			StartDate:     startDate,
			EndDate:       endDate,
		})
		if err != nil {
			http.Error(w, "urun performans refresh hatasi: "+err.Error(), http.StatusInternalServerError)
			return
		}
		_ = json.NewEncoder(w).Encode(result)
	}
}

func intQuery(r *http.Request, key string, fallback int) int {
	raw := strings.TrimSpace(r.URL.Query().Get(key))
	if raw == "" {
		return fallback
	}
	n, err := strconv.Atoi(raw)
	if err != nil || n <= 0 {
		return fallback
	}
	return n
}

func boolQuery(r *http.Request, key string, fallback bool) bool {
	raw := strings.TrimSpace(strings.ToLower(r.URL.Query().Get(key)))
	if raw == "" {
		return fallback
	}
	return raw == "1" || raw == "true" || raw == "yes" || raw == "on"
}

func parseDateOrZero(raw string) time.Time {
	raw = strings.TrimSpace(raw)
	if raw == "" {
		return time.Time{}
	}
	t, err := time.Parse("2006-01-02", raw)
	if err != nil {
		return time.Time{}
	}
	return t
}