package cmd

import (
	"context"
	"encoding/json"
	"io"
	"net/http"
	"net/http/httptest"
	"os"
	"strings"
	"testing"

	"google.golang.org/api/gmail/v1"
	"google.golang.org/api/option"

	"github.com/steipete/gogcli/internal/outfmt"
	"github.com/steipete/gogcli/internal/ui"
)

func TestGmailAutoForwardGetCmd_Text(t *testing.T) {
	origNew := newGmailService
	t.Cleanup(func() { newGmailService = origNew })

	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if strings.Contains(r.URL.Path, "/settings/autoForwarding") && r.Method == http.MethodGet {
			w.Header().Set("Content-Type", "application/json")
			_ = json.NewEncoder(w).Encode(map[string]any{
				"enabled":      true,
				"emailAddress": "a@example.com",
				"disposition":  "leaveInInbox",
			})
			return
		}
		http.NotFound(w, r)
	}))
	defer srv.Close()

	svc, err := gmail.NewService(context.Background(),
		option.WithoutAuthentication(),
		option.WithHTTPClient(srv.Client()),
		option.WithEndpoint(srv.URL+"/"),
	)
	if err != nil {
		t.Fatalf("NewService: %v", err)
	}
	newGmailService = func(context.Context, string) (*gmail.Service, error) { return svc, nil }

	flags := &RootFlags{Account: "a@b.com"}

	out := captureStdout(t, func() {
		u, uiErr := ui.New(ui.Options{Stdout: os.Stdout, Stderr: io.Discard, Color: "never"})
		if uiErr != nil {
			t.Fatalf("ui.New: %v", uiErr)
		}
		ctx := ui.WithUI(context.Background(), u)
		ctx = outfmt.WithMode(ctx, outfmt.Mode{})

		cmd := &GmailAutoForwardGetCmd{}
		if err := runKong(t, cmd, []string{}, ctx, flags); err != nil {
			t.Fatalf("execute: %v", err)
		}
	})

	if !strings.Contains(out, "enabled\ttrue") || !strings.Contains(out, "email_address\ta@example.com") {
		t.Fatalf("unexpected output: %q", out)
	}
}

func TestGmailAutoForwardUpdateCmd_JSONAndValidation(t *testing.T) {
	origNew := newGmailService
	t.Cleanup(func() { newGmailService = origNew })

	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if strings.Contains(r.URL.Path, "/settings/autoForwarding") && r.Method == http.MethodGet {
			w.Header().Set("Content-Type", "application/json")
			_ = json.NewEncoder(w).Encode(map[string]any{
				"enabled":      false,
				"emailAddress": "old@example.com",
				"disposition":  "leaveInInbox",
			})
			return
		}
		if strings.Contains(r.URL.Path, "/settings/autoForwarding") && r.Method == http.MethodPut {
			w.Header().Set("Content-Type", "application/json")
			_ = json.NewEncoder(w).Encode(map[string]any{
				"enabled":      true,
				"emailAddress": "new@example.com",
				"disposition":  "archive",
			})
			return
		}
		http.NotFound(w, r)
	}))
	defer srv.Close()

	svc, err := gmail.NewService(context.Background(),
		option.WithoutAuthentication(),
		option.WithHTTPClient(srv.Client()),
		option.WithEndpoint(srv.URL+"/"),
	)
	if err != nil {
		t.Fatalf("NewService: %v", err)
	}
	newGmailService = func(context.Context, string) (*gmail.Service, error) { return svc, nil }

	flags := &RootFlags{Account: "a@b.com"}

	cmd := &GmailAutoForwardUpdateCmd{}
	if err := runKong(t, cmd, []string{"--disposition", "nope"}, context.Background(), flags); err == nil {
		t.Fatalf("expected validation error")
	}

	jsonOut := captureStdout(t, func() {
		u, uiErr := ui.New(ui.Options{Stdout: io.Discard, Stderr: io.Discard, Color: "never"})
		if uiErr != nil {
			t.Fatalf("ui.New: %v", uiErr)
		}
		ctx := ui.WithUI(context.Background(), u)
		ctx = outfmt.WithMode(ctx, outfmt.Mode{JSON: true})

		cmd2 := &GmailAutoForwardUpdateCmd{}
		if err := runKong(t, cmd2, []string{"--enable", "--email", "new@example.com", "--disposition", "archive"}, ctx, flags); err != nil {
			t.Fatalf("execute: %v", err)
		}
	})

	var parsed struct {
		AutoForwarding struct {
			Enabled      bool   `json:"enabled"`
			EmailAddress string `json:"emailAddress"`
			Disposition  string `json:"disposition"`
		} `json:"autoForwarding"`
	}
	if err := json.Unmarshal([]byte(jsonOut), &parsed); err != nil {
		t.Fatalf("json parse: %v", err)
	}
	if !parsed.AutoForwarding.Enabled || parsed.AutoForwarding.EmailAddress != "new@example.com" {
		t.Fatalf("unexpected json: %#v", parsed.AutoForwarding)
	}
}