package cmd

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

	keepapi "google.golang.org/api/keep/v1"
	"google.golang.org/api/option"

	"github.com/steipete/gogcli/internal/config"
)

func writeKeepSA(t *testing.T, email string) string {
	t.Helper()

	saPath, err := config.KeepServiceAccountPath(email)
	if err != nil {
		t.Fatalf("KeepServiceAccountPath: %v", err)
	}
	if mkdirErr := os.MkdirAll(filepath.Dir(saPath), 0o700); mkdirErr != nil {
		t.Fatalf("mkdir: %v", mkdirErr)
	}
	if writeErr := os.WriteFile(saPath, []byte("{}"), 0o600); writeErr != nil {
		t.Fatalf("write: %v", writeErr)
	}
	return saPath
}

func TestGetKeepService_NoServiceAccountConfigured(t *testing.T) {
	home := t.TempDir()
	t.Setenv("HOME", home)
	t.Setenv("XDG_CONFIG_HOME", filepath.Join(home, "xdg-config"))

	orig := newKeepServiceWithSA
	t.Cleanup(func() { newKeepServiceWithSA = orig })

	called := false
	newKeepServiceWithSA = func(context.Context, string, string) (*keepapi.Service, error) {
		called = true
		return &keepapi.Service{}, nil
	}

	_, err := getKeepService(context.Background(), &RootFlags{Account: "a@b.com"}, &KeepCmd{})
	if err == nil {
		t.Fatalf("expected error")
	}
	if ExitCode(err) != 2 {
		t.Fatalf("expected exit code 2, got %v", ExitCode(err))
	}
	if called {
		t.Fatalf("expected no service account usage")
	}
}

func TestGetKeepService_UsesStoredServiceAccount(t *testing.T) {
	home := t.TempDir()
	t.Setenv("HOME", home)
	t.Setenv("XDG_CONFIG_HOME", filepath.Join(home, "xdg-config"))

	account := "a@b.com"
	saPath := writeKeepSA(t, account)

	orig := newKeepServiceWithSA
	t.Cleanup(func() { newKeepServiceWithSA = orig })

	var gotPath, gotImpersonate string
	newKeepServiceWithSA = func(ctx context.Context, path, impersonate string) (*keepapi.Service, error) {
		gotPath = path
		gotImpersonate = impersonate
		return &keepapi.Service{}, nil
	}

	svc, err := getKeepService(context.Background(), &RootFlags{Account: account}, &KeepCmd{})
	if err != nil {
		t.Fatalf("getKeepService: %v", err)
	}
	if svc == nil {
		t.Fatalf("expected service")
	}
	if gotPath != saPath {
		t.Fatalf("unexpected path: %q", gotPath)
	}
	if gotImpersonate != account {
		t.Fatalf("unexpected impersonate: %q", gotImpersonate)
	}
}

func TestKeepList_Plain(t *testing.T) {
	home := t.TempDir()
	t.Setenv("HOME", home)
	t.Setenv("XDG_CONFIG_HOME", filepath.Join(home, "xdg-config"))

	account := "a@b.com"
	_ = writeKeepSA(t, account)

	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		switch r.URL.Path {
		case "/v1/notes":
			_, _ = io.WriteString(w, `{"notes":[{"name":"notes/abc","title":"","updateTime":"2026-01-01T00:00:00Z","body":{"text":{"text":"hello\nworld (longer than fifty chars, so it truncates)"}}}],"nextPageToken":"p2"}`)
			return
		default:
			http.NotFound(w, r)
		}
	}))
	t.Cleanup(srv.Close)

	orig := newKeepServiceWithSA
	t.Cleanup(func() { newKeepServiceWithSA = orig })
	newKeepServiceWithSA = func(ctx context.Context, _, _ string) (*keepapi.Service, error) {
		return keepapi.NewService(ctx,
			option.WithEndpoint(srv.URL+"/"),
			option.WithHTTPClient(srv.Client()),
			option.WithoutAuthentication(),
		)
	}

	stdout := captureStdout(t, func() {
		stderr := captureStderr(t, func() {
			if err := Execute([]string{"keep", "list", "--plain", "--account", account}); err != nil {
				t.Fatalf("Execute: %v", err)
			}
		})
		if !strings.Contains(stderr, "Next page") || !strings.Contains(stderr, "p2") {
			t.Fatalf("expected next page hint, got: %q", stderr)
		}
	})
	if !strings.Contains(stdout, "notes/abc") {
		t.Fatalf("unexpected output: %q", stdout)
	}
	if !strings.Contains(stdout, "hello world") {
		t.Fatalf("expected snippet, got: %q", stdout)
	}
}

func TestKeepList_NoNotes(t *testing.T) {
	home := t.TempDir()
	t.Setenv("HOME", home)
	t.Setenv("XDG_CONFIG_HOME", filepath.Join(home, "xdg-config"))

	account := "a@b.com"
	_ = writeKeepSA(t, account)

	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		switch r.URL.Path {
		case "/v1/notes":
			_, _ = io.WriteString(w, `{"notes":[],"nextPageToken":""}`)
			return
		default:
			http.NotFound(w, r)
		}
	}))
	t.Cleanup(srv.Close)

	orig := newKeepServiceWithSA
	t.Cleanup(func() { newKeepServiceWithSA = orig })
	newKeepServiceWithSA = func(ctx context.Context, _, _ string) (*keepapi.Service, error) {
		return keepapi.NewService(ctx,
			option.WithEndpoint(srv.URL+"/"),
			option.WithHTTPClient(srv.Client()),
			option.WithoutAuthentication(),
		)
	}

	stderr := captureStderr(t, func() {
		_ = captureStdout(t, func() {
			if err := Execute([]string{"keep", "list", "--plain", "--account", account}); err != nil {
				t.Fatalf("Execute: %v", err)
			}
		})
	})
	if !strings.Contains(stderr, "No notes") {
		t.Fatalf("expected no-notes message, got: %q", stderr)
	}
}

func TestKeepList_JSON(t *testing.T) {
	home := t.TempDir()
	t.Setenv("HOME", home)
	t.Setenv("XDG_CONFIG_HOME", filepath.Join(home, "xdg-config"))

	account := "a@b.com"
	_ = writeKeepSA(t, account)

	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		switch r.URL.Path {
		case "/v1/notes":
			_, _ = io.WriteString(w, `{"notes":[{"name":"notes/abc","title":"T","updateTime":"2026-01-01T00:00:00Z"}],"nextPageToken":"p2"}`)
			return
		default:
			http.NotFound(w, r)
		}
	}))
	t.Cleanup(srv.Close)

	orig := newKeepServiceWithSA
	t.Cleanup(func() { newKeepServiceWithSA = orig })
	newKeepServiceWithSA = func(ctx context.Context, _, _ string) (*keepapi.Service, error) {
		return keepapi.NewService(ctx,
			option.WithEndpoint(srv.URL+"/"),
			option.WithHTTPClient(srv.Client()),
			option.WithoutAuthentication(),
		)
	}

	out := captureStdout(t, func() {
		_ = captureStderr(t, func() {
			if err := Execute([]string{"--json", "keep", "list", "--account", account}); err != nil {
				t.Fatalf("Execute: %v", err)
			}
		})
	})

	var payload struct {
		Notes         []any  `json:"notes"`
		NextPageToken string `json:"nextPageToken"`
	}
	if err := json.Unmarshal([]byte(out), &payload); err != nil {
		t.Fatalf("json parse: %v\nout=%q", err, out)
	}
	if len(payload.Notes) != 1 || payload.NextPageToken != "p2" {
		t.Fatalf("unexpected payload: %#v", payload)
	}
}

func TestKeepGet_Plain(t *testing.T) {
	home := t.TempDir()
	t.Setenv("HOME", home)
	t.Setenv("XDG_CONFIG_HOME", filepath.Join(home, "xdg-config"))

	account := "a@b.com"
	_ = writeKeepSA(t, account)

	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		switch r.URL.Path {
		case "/v1/notes/abc":
			_, _ = io.WriteString(w, `{"name":"notes/abc","title":"T","createTime":"2026-01-01T00:00:00Z","updateTime":"2026-01-02T00:00:00Z","trashed":false,"body":{"text":{"text":"body"}},"attachments":[{"name":"notes/abc/attachments/att1","mimeType":["text/plain"]}]}`)
			return
		default:
			http.NotFound(w, r)
		}
	}))
	t.Cleanup(srv.Close)

	orig := newKeepServiceWithSA
	t.Cleanup(func() { newKeepServiceWithSA = orig })
	newKeepServiceWithSA = func(ctx context.Context, _, _ string) (*keepapi.Service, error) {
		return keepapi.NewService(ctx,
			option.WithEndpoint(srv.URL+"/"),
			option.WithHTTPClient(srv.Client()),
			option.WithoutAuthentication(),
		)
	}

	out := captureStdout(t, func() {
		_ = captureStderr(t, func() {
			if err := Execute([]string{"keep", "get", "abc", "--plain", "--account", account}); err != nil {
				t.Fatalf("Execute: %v", err)
			}
		})
	})
	if !strings.Contains(out, "name\tnotes/abc") {
		t.Fatalf("unexpected output: %q", out)
	}
	if !strings.Contains(out, "attachments\t1") {
		t.Fatalf("expected attachments, got: %q", out)
	}
}

func TestKeepGet_JSON(t *testing.T) {
	home := t.TempDir()
	t.Setenv("HOME", home)
	t.Setenv("XDG_CONFIG_HOME", filepath.Join(home, "xdg-config"))

	account := "a@b.com"
	_ = writeKeepSA(t, account)

	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		switch r.URL.Path {
		case "/v1/notes/abc":
			_, _ = io.WriteString(w, `{"name":"notes/abc","title":"T","createTime":"2026-01-01T00:00:00Z","updateTime":"2026-01-02T00:00:00Z","trashed":false}`)
			return
		default:
			http.NotFound(w, r)
		}
	}))
	t.Cleanup(srv.Close)

	orig := newKeepServiceWithSA
	t.Cleanup(func() { newKeepServiceWithSA = orig })
	newKeepServiceWithSA = func(ctx context.Context, _, _ string) (*keepapi.Service, error) {
		return keepapi.NewService(ctx,
			option.WithEndpoint(srv.URL+"/"),
			option.WithHTTPClient(srv.Client()),
			option.WithoutAuthentication(),
		)
	}

	out := captureStdout(t, func() {
		_ = captureStderr(t, func() {
			if err := Execute([]string{"--json", "keep", "get", "abc", "--account", account}); err != nil {
				t.Fatalf("Execute: %v", err)
			}
		})
	})

	var payload struct {
		Note map[string]any `json:"note"`
	}
	if err := json.Unmarshal([]byte(out), &payload); err != nil {
		t.Fatalf("json parse: %v\nout=%q", err, out)
	}
	if payload.Note["name"] != "notes/abc" {
		t.Fatalf("unexpected note: %#v", payload.Note)
	}
}

func TestKeepSearch_Paging(t *testing.T) {
	home := t.TempDir()
	t.Setenv("HOME", home)
	t.Setenv("XDG_CONFIG_HOME", filepath.Join(home, "xdg-config"))

	account := "a@b.com"
	_ = writeKeepSA(t, account)

	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		switch r.URL.Path {
		case "/v1/notes":
			if r.URL.Query().Get("pageToken") == "" {
				_, _ = io.WriteString(w, `{"notes":[{"name":"notes/n1","title":"No match","updateTime":"2026-01-01T00:00:00Z","body":{"text":{"text":"zzz"}}}],"nextPageToken":"p2"}`)
				return
			}
			_, _ = io.WriteString(w, `{"notes":[{"name":"notes/n2","title":"","updateTime":"2026-01-01T00:00:00Z","body":{"text":{"text":"hello there"}}}],"nextPageToken":""}`)
			return
		default:
			http.NotFound(w, r)
		}
	}))
	t.Cleanup(srv.Close)

	orig := newKeepServiceWithSA
	t.Cleanup(func() { newKeepServiceWithSA = orig })
	newKeepServiceWithSA = func(ctx context.Context, _, _ string) (*keepapi.Service, error) {
		return keepapi.NewService(ctx,
			option.WithEndpoint(srv.URL+"/"),
			option.WithHTTPClient(srv.Client()),
			option.WithoutAuthentication(),
		)
	}

	stdout := captureStdout(t, func() {
		stderr := captureStderr(t, func() {
			if err := Execute([]string{"keep", "search", "hello", "--plain", "--account", account}); err != nil {
				t.Fatalf("Execute: %v", err)
			}
		})
		if !strings.Contains(stderr, "Found 1 notes matching") {
			t.Fatalf("unexpected stderr: %q", stderr)
		}
	})
	if !strings.Contains(stdout, "notes/n2") {
		t.Fatalf("unexpected output: %q", stdout)
	}
}

func TestKeepSearch_EmptyQuery(t *testing.T) {
	err := (&KeepSearchCmd{Query: " "}).Run(context.Background(), nil, nil)
	if err == nil {
		t.Fatalf("expected error")
	}
}

func TestKeepSearch_NoMatch(t *testing.T) {
	home := t.TempDir()
	t.Setenv("HOME", home)
	t.Setenv("XDG_CONFIG_HOME", filepath.Join(home, "xdg-config"))

	account := "a@b.com"
	_ = writeKeepSA(t, account)

	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		switch r.URL.Path {
		case "/v1/notes":
			_, _ = io.WriteString(w, `{"notes":[{"name":"notes/n1","title":"No match","updateTime":"2026-01-01T00:00:00Z","body":{"text":{"text":"zzz"}}}],"nextPageToken":""}`)
			return
		default:
			http.NotFound(w, r)
		}
	}))
	t.Cleanup(srv.Close)

	orig := newKeepServiceWithSA
	t.Cleanup(func() { newKeepServiceWithSA = orig })
	newKeepServiceWithSA = func(ctx context.Context, _, _ string) (*keepapi.Service, error) {
		return keepapi.NewService(ctx,
			option.WithEndpoint(srv.URL+"/"),
			option.WithHTTPClient(srv.Client()),
			option.WithoutAuthentication(),
		)
	}

	_ = captureStdout(t, func() {
		stderr := captureStderr(t, func() {
			if err := Execute([]string{"keep", "search", "hello", "--plain", "--account", account}); err != nil {
				t.Fatalf("Execute: %v", err)
			}
		})
		if !strings.Contains(stderr, "No notes matching") {
			t.Fatalf("unexpected stderr: %q", stderr)
		}
	})
}

func TestKeepAttachment_Download(t *testing.T) {
	home := t.TempDir()
	t.Setenv("HOME", home)
	t.Setenv("XDG_CONFIG_HOME", filepath.Join(home, "xdg-config"))

	account := "a@b.com"
	_ = writeKeepSA(t, account)

	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		switch r.URL.Path {
		case "/v1/notes/abc/attachments/att1":
			if r.URL.Query().Get("alt") != "media" {
				http.Error(w, "expected alt=media", http.StatusBadRequest)
				return
			}
			_, _ = io.WriteString(w, "payload")
			return
		default:
			http.NotFound(w, r)
		}
	}))
	t.Cleanup(srv.Close)

	orig := newKeepServiceWithSA
	t.Cleanup(func() { newKeepServiceWithSA = orig })
	newKeepServiceWithSA = func(ctx context.Context, _, _ string) (*keepapi.Service, error) {
		return keepapi.NewService(ctx,
			option.WithEndpoint(srv.URL+"/"),
			option.WithHTTPClient(srv.Client()),
			option.WithoutAuthentication(),
		)
	}

	cwd, getwdErr := os.Getwd()
	if getwdErr != nil {
		t.Fatalf("Getwd: %v", getwdErr)
	}
	tmp := t.TempDir()
	if chdirErr := os.Chdir(tmp); chdirErr != nil {
		t.Fatalf("Chdir: %v", chdirErr)
	}
	t.Cleanup(func() { _ = os.Chdir(cwd) })

	out := captureStdout(t, func() {
		_ = captureStderr(t, func() {
			if execErr := Execute([]string{"keep", "attachment", "notes/abc/attachments/att1", "--plain", "--account", account, "--mime-type", "text/plain", "--out", "out.bin"}); execErr != nil {
				t.Fatalf("Execute: %v", execErr)
			}
		})
	})
	if !strings.Contains(out, "path\tout.bin") {
		t.Fatalf("unexpected output: %q", out)
	}
	b, err := os.ReadFile(filepath.Join(tmp, "out.bin"))
	if err != nil {
		t.Fatalf("read out.bin: %v", err)
	}
	if string(b) != "payload" {
		t.Fatalf("unexpected payload: %q", string(b))
	}
}

func TestKeepAttachment_InvalidName(t *testing.T) {
	home := t.TempDir()
	t.Setenv("HOME", home)
	t.Setenv("XDG_CONFIG_HOME", filepath.Join(home, "xdg-config"))

	account := "a@b.com"
	_ = writeKeepSA(t, account)

	orig := newKeepServiceWithSA
	t.Cleanup(func() { newKeepServiceWithSA = orig })
	newKeepServiceWithSA = func(context.Context, string, string) (*keepapi.Service, error) {
		return &keepapi.Service{}, nil
	}

	err := (&KeepAttachmentCmd{AttachmentName: "nope"}).Run(context.Background(), &RootFlags{Account: account}, &KeepCmd{})
	if err == nil {
		t.Fatalf("expected error")
	}
}

func TestKeepAttachment_DefaultOutAndMkdir(t *testing.T) {
	home := t.TempDir()
	t.Setenv("HOME", home)
	t.Setenv("XDG_CONFIG_HOME", filepath.Join(home, "xdg-config"))

	account := "a@b.com"
	_ = writeKeepSA(t, account)

	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		switch r.URL.Path {
		case "/v1/notes/abc/attachments/att1":
			_, _ = io.WriteString(w, "payload")
			return
		default:
			http.NotFound(w, r)
		}
	}))
	t.Cleanup(srv.Close)

	orig := newKeepServiceWithSA
	t.Cleanup(func() { newKeepServiceWithSA = orig })
	newKeepServiceWithSA = func(ctx context.Context, _, _ string) (*keepapi.Service, error) {
		return keepapi.NewService(ctx,
			option.WithEndpoint(srv.URL+"/"),
			option.WithHTTPClient(srv.Client()),
			option.WithoutAuthentication(),
		)
	}

	cwd, getwdErr := os.Getwd()
	if getwdErr != nil {
		t.Fatalf("Getwd: %v", getwdErr)
	}
	tmp := t.TempDir()
	if chdirErr := os.Chdir(tmp); chdirErr != nil {
		t.Fatalf("Chdir: %v", chdirErr)
	}
	t.Cleanup(func() { _ = os.Chdir(cwd) })

	out := captureStdout(t, func() {
		_ = captureStderr(t, func() {
			if execErr := Execute([]string{"keep", "attachment", "notes/abc/attachments/att1", "--plain", "--account", account, "--mime-type", "text/plain", "--out", "dir/out.bin"}); execErr != nil {
				t.Fatalf("Execute: %v", execErr)
			}
		})
	})
	if !strings.Contains(out, "path\tdir/out.bin") {
		t.Fatalf("unexpected output: %q", out)
	}
	if _, err := os.Stat(filepath.Join(tmp, "dir", "out.bin")); err != nil {
		t.Fatalf("expected output file: %v", err)
	}

	out = captureStdout(t, func() {
		_ = captureStderr(t, func() {
			if execErr := Execute([]string{"keep", "attachment", "notes/abc/attachments/att1", "--plain", "--account", account, "--mime-type", "text/plain"}); execErr != nil {
				t.Fatalf("Execute: %v", execErr)
			}
		})
	})
	if !strings.Contains(out, "path\tatt1") {
		t.Fatalf("unexpected output: %q", out)
	}
	if _, err := os.Stat(filepath.Join(tmp, "att1")); err != nil {
		t.Fatalf("expected output file: %v", err)
	}
}

func TestGetKeepService_ServiceAccountOverride(t *testing.T) {
	orig := newKeepServiceWithSA
	t.Cleanup(func() { newKeepServiceWithSA = orig })

	newKeepServiceWithSA = func(context.Context, string, string) (*keepapi.Service, error) {
		return &keepapi.Service{}, nil
	}

	_, err := getKeepService(context.Background(), nil, &KeepCmd{ServiceAccount: "sa.json"})
	if err == nil {
		t.Fatalf("expected error")
	}
}

func TestGetKeepService_ServiceAccountOverride_CallsBuilder(t *testing.T) {
	orig := newKeepServiceWithSA
	t.Cleanup(func() { newKeepServiceWithSA = orig })

	var gotPath, gotImpersonate string
	newKeepServiceWithSA = func(_ context.Context, path, impersonate string) (*keepapi.Service, error) {
		gotPath = path
		gotImpersonate = impersonate
		return &keepapi.Service{}, nil
	}

	_, err := getKeepService(context.Background(), nil, &KeepCmd{ServiceAccount: "sa.json", Impersonate: "a@b.com"})
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if gotPath != "sa.json" || gotImpersonate != "a@b.com" {
		t.Fatalf("unexpected args: path=%q impersonate=%q", gotPath, gotImpersonate)
	}
}

func TestGetKeepService_UsesLegacyPath(t *testing.T) {
	home := t.TempDir()
	t.Setenv("HOME", home)
	t.Setenv("XDG_CONFIG_HOME", filepath.Join(home, "xdg-config"))

	account := "a@b.com"
	legacyPath, err := config.KeepServiceAccountLegacyPath(account)
	if err != nil {
		t.Fatalf("KeepServiceAccountLegacyPath: %v", err)
	}
	if mkdirErr := os.MkdirAll(filepath.Dir(legacyPath), 0o700); mkdirErr != nil {
		t.Fatalf("mkdir: %v", mkdirErr)
	}
	if writeErr := os.WriteFile(legacyPath, []byte("{}"), 0o600); writeErr != nil {
		t.Fatalf("write: %v", writeErr)
	}

	orig := newKeepServiceWithSA
	t.Cleanup(func() { newKeepServiceWithSA = orig })

	var gotPath string
	newKeepServiceWithSA = func(_ context.Context, path, _ string) (*keepapi.Service, error) {
		gotPath = path
		return &keepapi.Service{}, nil
	}

	_, err = getKeepService(context.Background(), &RootFlags{Account: account}, &KeepCmd{})
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if gotPath != legacyPath {
		t.Fatalf("unexpected path: %q", gotPath)
	}
}