package api

import (
	"context"
	"errors"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"testing"
	"time"
)

func TestFetchSubscriptionDetail_Success(t *testing.T) {
	body, err := os.ReadFile(filepath.Join("testdata", "sample.json"))
	if err != nil {
		t.Fatalf("read sample: %v", err)
	}

	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if got := r.Header.Get("Authorization"); got != "Bearer test-key" {
			t.Errorf("Authorization = %q", got)
		}
		if r.URL.Path != "/api/v1/management/subscription/detail" {
			t.Errorf("path = %q", r.URL.Path)
		}
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write(body)
	}))
	defer srv.Close()

	c := &Client{BaseURL: srv.URL, HTTPClient: srv.Client()}
	resp, raw, err := c.FetchSubscriptionDetail(context.Background(), "test-key")
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if !resp.Success {
		t.Error("resp.Success = false")
	}
	if resp.Data.Plan.Tier != "ultra" {
		t.Errorf("plan.tier = %q", resp.Data.Plan.Tier)
	}
	if resp.Data.Quota7Day.UsedValueUSD != 13.66 {
		t.Errorf("quota_7_day.used_value_usd = %v", resp.Data.Quota7Day.UsedValueUSD)
	}
	if resp.Data.QuotaMonthly.MaxValueUSD != 1134.33 {
		t.Errorf("quota_monthly.max_value_usd = %v", resp.Data.QuotaMonthly.MaxValueUSD)
	}
	if len(raw) != len(body) {
		t.Errorf("raw body length mismatch: got %d want %d", len(raw), len(body))
	}
}

func TestFetchSubscriptionDetail_StatusMapping(t *testing.T) {
	cases := []struct {
		name   string
		status int
		target error
	}{
		{"401", http.StatusUnauthorized, ErrUnauthorized},
		{"403", http.StatusForbidden, ErrUnauthorized},
		{"422", http.StatusUnprocessableEntity, ErrRateLimited},
		{"429", http.StatusTooManyRequests, ErrRateLimited},
		{"500", http.StatusInternalServerError, ErrServer},
		{"502", http.StatusBadGateway, ErrServer},
	}
	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
				w.WriteHeader(tc.status)
				_, _ = w.Write([]byte(`{"success":false,"error":"x"}`))
			}))
			defer srv.Close()
			c := &Client{BaseURL: srv.URL, HTTPClient: srv.Client()}
			_, _, err := c.FetchSubscriptionDetail(context.Background(), "k")
			if !errors.Is(err, tc.target) {
				t.Fatalf("want %v, got %v", tc.target, err)
			}
		})
	}
}

func TestFetchSubscriptionDetail_MalformedJSON(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		_, _ = w.Write([]byte(`{"success": not-json`))
	}))
	defer srv.Close()
	c := &Client{BaseURL: srv.URL, HTTPClient: srv.Client()}
	_, _, err := c.FetchSubscriptionDetail(context.Background(), "k")
	if !errors.Is(err, ErrBadResponse) {
		t.Fatalf("want ErrBadResponse, got %v", err)
	}
}

func TestFetchSubscriptionDetail_SuccessFalse(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		_, _ = w.Write([]byte(`{"success":false,"error":"explicit failure"}`))
	}))
	defer srv.Close()
	c := &Client{BaseURL: srv.URL, HTTPClient: srv.Client()}
	_, _, err := c.FetchSubscriptionDetail(context.Background(), "k")
	if !errors.Is(err, ErrBadResponse) {
		t.Fatalf("want ErrBadResponse, got %v", err)
	}
}

func TestFetchSubscriptionDetail_Timeout(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		time.Sleep(100 * time.Millisecond)
		w.WriteHeader(http.StatusOK)
	}))
	defer srv.Close()
	c := &Client{BaseURL: srv.URL, HTTPClient: &http.Client{Timeout: 5 * time.Millisecond}}
	_, _, err := c.FetchSubscriptionDetail(context.Background(), "k")
	if !errors.Is(err, ErrTimeout) {
		t.Fatalf("want ErrTimeout, got %v", err)
	}
}