//go:build e2e

package e2e

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"os"
	"path/filepath"
	"testing"
	"time"
)

var sharedFixture Fixture

func TestMain(m *testing.M) {
	if err := loadSharedFixture(); err != nil {
		fmt.Fprintf(os.Stderr, "e2e bootstrap: %v\n", err)
		os.Exit(1)
	}
	os.Exit(m.Run())
}

// e2eStep prints a one-line banner at the start of every E2E test so `go test -v`
// shows the user-facing test ID, HTTP method/path, and a Chinese summary instead
// of just the Go function name. Format:
//
//	▶ [M-01] GET /api/v1/members/me — 讀 profile
//
// Keep IDs in sync with docs/e2e-testing.md (測試覆蓋矩陣).
func e2eStep(t *testing.T, id, method, path, desc string) {
	t.Helper()
	switch {
	case method == "" && path == "":
		t.Logf("▶ [%s] %s", id, desc)
	case method == "":
		t.Logf("▶ [%s] %s — %s", id, path, desc)
	default:
		t.Logf("▶ [%s] %s %s — %s", id, method, path, desc)
	}
}

func loadSharedFixture() error {
	path := os.Getenv("E2E_STATE_FILE")
	if path == "" {
		path = filepath.Join("fixtures", "state.json")
	}
	raw, err := os.ReadFile(path)
	if err != nil {
		return fmt.Errorf("read %s: %w (run make e2e-full)", path, err)
	}
	if err := json.Unmarshal(raw, &sharedFixture); err != nil {
		return err
	}
	if sharedFixture.BaseURL == "" || sharedFixture.AccessToken == "" {
		return fmt.Errorf("invalid fixture in %s", path)
	}
	if override := os.Getenv("E2E_BASE_URL"); override != "" {
		sharedFixture.BaseURL = override
	}
	return nil
}

func refreshTokenPair(baseURL, refreshToken string) (Fixture, error) {
	body, _ := json.Marshal(map[string]string{"refresh_token": refreshToken})
	req, err := http.NewRequest(http.MethodPost, baseURL+"/api/v1/auth/token/refresh", bytes.NewReader(body))
	if err != nil {
		return Fixture{}, err
	}
	req.Header.Set("Content-Type", "application/json")
	client := &http.Client{Timeout: 15 * time.Second}
	resp, err := client.Do(req)
	if err != nil {
		return Fixture{}, err
	}
	defer resp.Body.Close()
	raw, err := io.ReadAll(resp.Body)
	if err != nil {
		return Fixture{}, err
	}
	var env Envelope
	if err := json.Unmarshal(raw, &env); err != nil {
		return Fixture{}, err
	}
	if resp.StatusCode != http.StatusOK || env.Code != successCode {
		return Fixture{}, fmt.Errorf("refresh failed: status=%d code=%d", resp.StatusCode, env.Code)
	}
	var data struct {
		AccessToken  string `json:"access_token"`
		RefreshToken string `json:"refresh_token"`
	}
	if err := json.Unmarshal(env.Data, &data); err != nil {
		return Fixture{}, err
	}
	out := Fixture{AccessToken: data.AccessToken, RefreshToken: data.RefreshToken}
	if out.AccessToken == "" || out.RefreshToken == "" {
		return Fixture{}, fmt.Errorf("refresh returned empty tokens")
	}
	return out, nil
}

func loadFixture() Fixture {
	return sharedFixture
}

func freshClient(t *testing.T) *Client {
	t.Helper()
	fx := loadFixture()
	base := fx.BaseURL
	if override := os.Getenv("E2E_BASE_URL"); override != "" {
		base = override
	}
	return &Client{
		BaseURL: base,
		HTTP:    &http.Client{Timeout: 15 * time.Second},
		Fixture: fx,
	}
}

func isolatedAuthClient(t *testing.T) *Client {
	t.Helper()
	path := os.Getenv("E2E_STATE_FILE")
	if path == "" {
		path = filepath.Join("fixtures", "state.json")
	}
	raw, err := os.ReadFile(path)
	if err != nil {
		t.Fatalf("read fixture: %v", err)
	}
	var fx Fixture
	if err := json.Unmarshal(raw, &fx); err != nil {
		t.Fatalf("parse fixture: %v", err)
	}
	if override := os.Getenv("E2E_BASE_URL"); override != "" {
		fx.BaseURL = override
	}
	pair, err := refreshTokenPair(fx.BaseURL, fx.RefreshToken)
	if err != nil {
		t.Fatalf("isolated refresh: %v", err)
	}
	fx.AccessToken = pair.AccessToken
	fx.RefreshToken = pair.RefreshToken
	return &Client{
		BaseURL: fx.BaseURL,
		HTTP:    &http.Client{Timeout: 15 * time.Second},
		Fixture: fx,
	}
}