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", 50000),
			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", 50000))
		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", 50000))
		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", 50000),
		)
		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", 50000))
		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", 50000))
		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", 50000))
		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", 50000))
		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", 50000),
		)
		if err != nil {
			http.Error(w, "musteri performans kirilimi alinamadi: "+err.Error(), http.StatusInternalServerError)
			return
		}
		_ = json.NewEncoder(w).Encode(rows)
	}
}

func GetProductPerformanceSalesBreakdownHandler(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), 45*time.Second)
		defer cancel()

		rows, err := queries.ListProductPerformanceSalesBreakdown(
			ctx,
			pg,
			strings.TrimSpace(r.URL.Query().Get("mode")),
			intQuery(r, "limit", 50000),
		)
		if err != nil {
			http.Error(w, "satis kpi kirilimi alinamadi: "+err.Error(), http.StatusInternalServerError)
			return
		}
		_ = json.NewEncoder(w).Encode(rows)
	}
}

func GetProductPerformanceGroupedHandler(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()

		mode := strings.TrimSpace(r.URL.Query().Get("mode"))
		mainGroup := strings.TrimSpace(r.URL.Query().Get("urun_ana_grubu"))
		groupLevels := splitCSVQuery(r.URL.Query().Get("group_levels"))
		limit := intQuery(r, "limit", 50000)
		expanded := map[string]bool{}
		if r.Method == http.MethodPost {
			var body struct {
				Mode         string   `json:"mode"`
				GroupLevels  []string `json:"group_levels"`
				ExpandedKeys []string `json:"expanded_keys"`
				Limit        int      `json:"limit"`
				MainGroup    string   `json:"urun_ana_grubu"`
			}
			if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
				http.Error(w, "gecersiz grup istegi: "+err.Error(), http.StatusBadRequest)
				return
			}
			if strings.TrimSpace(body.Mode) != "" {
				mode = strings.TrimSpace(body.Mode)
			}
			if strings.TrimSpace(body.MainGroup) != "" {
				mainGroup = strings.TrimSpace(body.MainGroup)
			}
			if len(body.GroupLevels) > 0 {
				groupLevels = body.GroupLevels
			}
			if body.Limit > 0 {
				limit = body.Limit
			}
			for _, key := range body.ExpandedKeys {
				key = strings.TrimSpace(key)
				if key != "" {
					expanded[key] = true
				}
			}
		} else {
			for _, key := range strings.Split(r.URL.Query().Get("expanded_keys"), ",") {
				key = strings.TrimSpace(key)
				if key != "" {
					expanded[key] = true
				}
			}
		}

		rows, err := queries.ListProductPerformanceGrouped(ctx, pg, queries.ProductPerformanceGroupedRequest{
			Mode:         mode,
			GroupLevels:  groupLevels,
			ExpandedKeys: expanded,
			Limit:        limit,
			MainGroup:    mainGroup,
		})
		if err != nil {
			http.Error(w, "urun performans grup verisi alinamadi: "+err.Error(), http.StatusInternalServerError)
			return
		}
		_ = json.NewEncoder(w).Encode(rows)
	}
}

func splitCSVQuery(value string) []string {
	parts := strings.Split(value, ",")
	out := make([]string, 0, len(parts))
	for _, part := range parts {
		part = strings.TrimSpace(part)
		if part != "" {
			out = append(out, part)
		}
	}
	return out
}

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"
}