package handlers

import (
	"log/slog"
	"net/http"
	"strconv"

	"github.com/go-chi/chi/v5"

	"git.seaofstars.xyz/mohd/deflated/internal/db"
)

// ItemHandler handles routes that return price and inflation data.
type ItemHandler struct {
	queries *db.Queries
}

func NewItemHandler(queries *db.Queries) *ItemHandler {
	return &ItemHandler{queries: queries}
}

// List handles GET /api/items
func (h *ItemHandler) List(w http.ResponseWriter, r *http.Request) {
	items, err := h.queries.ListCanonicalItems(r.Context())
	if err != nil {
		slog.Error("list items", "error", err)
		writeError(w, http.StatusInternalServerError, "database error")
		return
	}
	writeJSON(w, http.StatusOK, items)
}

// PriceHistory handles GET /api/items/{name}/history
func (h *ItemHandler) PriceHistory(w http.ResponseWriter, r *http.Request) {
	name := chi.URLParam(r, "name")
	history, err := h.queries.GetPriceHistory(r.Context(), name)
	if err != nil {
		slog.Error("get price history", "error", err, "name", name)
		writeError(w, http.StatusInternalServerError, "database error")
		return
	}
	writeJSON(w, http.StatusOK, history)
}

// TopMovers handles GET /api/items/top-movers?months=12&limit=10
func (h *ItemHandler) TopMovers(w http.ResponseWriter, r *http.Request) {
	months, _ := strconv.Atoi(r.URL.Query().Get("months"))
	if months <= 0 {
		months = 12
	}
	limit, _ := strconv.Atoi(r.URL.Query().Get("limit"))
	if limit <= 0 {
		limit = 10
	}

	movers, err := h.queries.GetTopMovers(r.Context(), months, limit)
	if err != nil {
		slog.Error("get top movers", "error", err)
		writeError(w, http.StatusInternalServerError, "database error")
		return
	}
	writeJSON(w, http.StatusOK, movers)
}

// InflationSummary handles GET /api/inflation/summary?base_year=2009
func (h *ItemHandler) InflationSummary(w http.ResponseWriter, r *http.Request) {
	baseYear, _ := strconv.Atoi(r.URL.Query().Get("base_year"))
	if baseYear <= 0 {
		baseYear = 2009
	}

	summary, err := h.queries.GetInflationSummary(r.Context(), baseYear)
	if err != nil {
		slog.Error("get inflation summary", "error", err)
		writeError(w, http.StatusInternalServerError, "database error")
		return
	}
	writeJSON(w, http.StatusOK, summary)
}