package chatd

import (
	"context"
	"database/sql"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
	"time"

	"charm.land/fantasy"
	fantasyopenai "charm.land/fantasy/providers/openai"
	fantasyopenaicompat "charm.land/fantasy/providers/openaicompat"
	"github.com/google/uuid"
	"github.com/sqlc-dev/pqtype"
	"github.com/stretchr/testify/require"
	"go.uber.org/mock/gomock"
	"golang.org/x/xerrors"

	"cdr.dev/slog/v3/sloggers/slogtest"
	"github.com/coder/coder/v2/coderd/database"
	"github.com/coder/coder/v2/coderd/database/dbgen"
	"github.com/coder/coder/v2/coderd/database/dbmock"
	"github.com/coder/coder/v2/coderd/database/dbtestutil"
	"github.com/coder/coder/v2/coderd/x/chatd/chatprompt"
	"github.com/coder/coder/v2/coderd/x/chatd/chatprovider"
	"github.com/coder/coder/v2/coderd/x/chatd/chattest"
	"github.com/coder/coder/v2/codersdk"
	"github.com/coder/coder/v2/testutil"
)

func Test_extractManualTitleTurns(t *testing.T) {
	t.Parallel()

	pasteFileID := uuid.New()

	tests := []struct {
		name      string
		messages  []database.ChatMessage
		pasteText map[uuid.UUID]string
		want      []manualTitleTurn
	}{
		{
			name: "paste only user message resolves via paste text",
			messages: []database.ChatMessage{
				mustChatMessage(t, database.ChatMessageRoleUser, database.ChatMessageVisibilityBoth,
					codersdk.ChatMessageFile(pasteFileID, "text/plain", "pasted-text-2026-01-02-03-04-05.txt"),
				),
			},
			pasteText: map[uuid.UUID]string{pasteFileID: "pasted panic output"},
			want:      []manualTitleTurn{{role: "user", text: "pasted panic output"}},
		},
		{
			name: "filters to visible user and assistant text turns",
			messages: []database.ChatMessage{
				mustChatMessage(t, database.ChatMessageRoleUser, database.ChatMessageVisibilityBoth,
					codersdk.ChatMessagePart{Type: codersdk.ChatMessagePartTypeText, Text: "  review quickgen helpers  "},
				),
				mustChatMessage(t, database.ChatMessageRoleAssistant, database.ChatMessageVisibilityBoth,
					codersdk.ChatMessagePart{Type: codersdk.ChatMessagePartTypeText, Text: "  drafted a plan  "},
				),
				mustChatMessage(t, database.ChatMessageRoleSystem, database.ChatMessageVisibilityBoth,
					codersdk.ChatMessagePart{Type: codersdk.ChatMessagePartTypeText, Text: "system prompt"},
				),
				mustChatMessage(t, database.ChatMessageRoleTool, database.ChatMessageVisibilityBoth,
					codersdk.ChatMessagePart{Type: codersdk.ChatMessagePartTypeText, Text: "tool output"},
				),
				mustChatMessage(t, database.ChatMessageRoleUser, database.ChatMessageVisibilityModel,
					codersdk.ChatMessagePart{Type: codersdk.ChatMessagePartTypeText, Text: "hidden model note"},
				),
				mustChatMessage(t, database.ChatMessageRoleUser, database.ChatMessageVisibilityBoth,
					codersdk.ChatMessagePart{Type: codersdk.ChatMessagePartTypeText, Text: "   "},
				),
				mustChatMessage(t, database.ChatMessageRoleAssistant, database.ChatMessageVisibilityBoth,
					codersdk.ChatMessagePart{Type: codersdk.ChatMessagePartTypeReasoning, Text: "reasoning only"},
				),
				mustChatMessage(t, database.ChatMessageRoleUser, database.ChatMessageVisibilityBoth,
					codersdk.ChatMessagePart{Type: codersdk.ChatMessagePartTypeFile, MediaType: "text/plain"},
				),
			},
			want: []manualTitleTurn{
				{role: "user", text: "review quickgen helpers"},
				{role: "assistant", text: "drafted a plan"},
			},
		},
		{
			name: "reuses text extraction for multi-part content",
			messages: []database.ChatMessage{
				mustChatMessage(t, database.ChatMessageRoleUser, database.ChatMessageVisibilityBoth,
					codersdk.ChatMessagePart{Type: codersdk.ChatMessagePartTypeText, Text: "first chunk"},
					codersdk.ChatMessagePart{Type: codersdk.ChatMessagePartTypeReasoning, Text: "skip me"},
					codersdk.ChatMessagePart{Type: codersdk.ChatMessagePartTypeText, Text: " second chunk "},
				),
			},
			want: []manualTitleTurn{{role: "user", text: "first chunk second chunk"}},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()

			got := extractManualTitleTurns(tt.messages, tt.pasteText)
			require.Equal(t, tt.want, got)
		})
	}
}

func Test_selectManualTitleTurnIndexes(t *testing.T) {
	t.Parallel()

	tests := []struct {
		name  string
		turns []manualTitleTurn
		want  []int
	}{
		{
			name: "single user turn",
			turns: []manualTitleTurn{
				{role: "user", text: "one"},
			},
			want: []int{0},
		},
		{
			name: "first user plus trailing window",
			turns: []manualTitleTurn{
				{role: "user", text: "one"},
				{role: "assistant", text: "two"},
				{role: "user", text: "three"},
				{role: "assistant", text: "four"},
				{role: "user", text: "five"},
			},
			want: []int{0, 2, 3, 4},
		},
		{
			name: "two turns returns both",
			turns: []manualTitleTurn{
				{role: "user", text: "one"},
				{role: "assistant", text: "two"},
			},
			want: []int{0, 1},
		},
		{
			name: "prepends first user when before trailing window",
			turns: []manualTitleTurn{
				{role: "assistant", text: "intro"},
				{role: "assistant", text: "setup"},
				{role: "user", text: "goal"},
				{role: "assistant", text: "a"},
				{role: "assistant", text: "b"},
				{role: "assistant", text: "c"},
			},
			want: []int{2, 3, 4, 5},
		},
		{
			name: "ten plus turns keeps first user and last three",
			turns: []manualTitleTurn{
				{role: "assistant", text: "0"},
				{role: "assistant", text: "1"},
				{role: "user", text: "2"},
				{role: "assistant", text: "3"},
				{role: "assistant", text: "4"},
				{role: "assistant", text: "5"},
				{role: "assistant", text: "6"},
				{role: "assistant", text: "7"},
				{role: "assistant", text: "8"},
				{role: "user", text: "9"},
				{role: "assistant", text: "10"},
				{role: "user", text: "11"},
			},
			want: []int{2, 9, 10, 11},
		},
		{
			name: "no user turns",
			turns: []manualTitleTurn{
				{role: "assistant", text: "one"},
				{role: "assistant", text: "two"},
			},
			want: nil,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()

			got := selectManualTitleTurnIndexes(tt.turns)
			require.Equal(t, tt.want, got)
		})
	}
}

func Test_buildManualTitleContext(t *testing.T) {
	t.Parallel()

	longConversationText := strings.Repeat("a", 3500)
	longLatestUserText := strings.Repeat("z", 1200)

	tests := []struct {
		name                   string
		turns                  []manualTitleTurn
		selected               []int
		wantConversation       string
		wantConversationEmpty  bool
		wantConversationHasGap bool
		wantConversationRunes  int
		wantLatestUser         string
		wantLatestUserRunes    int
		wantLatestUserContains string
		wantLatestUserNotEmpty bool
	}{
		{
			name: "adds gap marker when selected turns skip earlier context",
			turns: []manualTitleTurn{
				{role: "user", text: "open pull request"},
				{role: "assistant", text: "checked CI"},
				{role: "user", text: "review logs"},
				{role: "assistant", text: "found flaky test"},
				{role: "user", text: "update chat title"},
			},
			selected:               []int{0, 3, 4},
			wantConversationHasGap: true,
			wantLatestUser:         "update chat title",
		},
		{
			name: "omits gap marker for contiguous selection",
			turns: []manualTitleTurn{
				{role: "user", text: "open pull request"},
				{role: "assistant", text: "checked CI"},
				{role: "user", text: "update chat title"},
			},
			selected:               []int{0, 1, 2},
			wantConversation:       "[user]: open pull request\n[assistant]: checked CI\n[user]: update chat title",
			wantConversationHasGap: false,
			wantLatestUser:         "update chat title",
		},
		{
			name:                  "single useful user turn returns empty conversation block",
			turns:                 []manualTitleTurn{{role: "user", text: "rename helper"}},
			selected:              []int{0},
			wantConversationEmpty: true,
			wantLatestUser:        "rename helper",
		},
		{
			name: "truncates conversation block at six thousand runes",
			turns: []manualTitleTurn{
				{role: "user", text: longConversationText},
				{role: "assistant", text: longConversationText},
				{role: "user", text: "latest"},
			},
			selected:              []int{0, 1, 2},
			wantConversationRunes: 6000,
			wantLatestUser:        "latest",
		},
		{
			name: "truncates latest user message at one thousand runes",
			turns: []manualTitleTurn{
				{role: "user", text: "first"},
				{role: "assistant", text: "reply"},
				{role: "user", text: longLatestUserText},
			},
			selected:               []int{0, 1, 2},
			wantLatestUserRunes:    1000,
			wantLatestUserContains: strings.Repeat("z", 1000),
			wantLatestUserNotEmpty: true,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()

			conversationBlock, latestUserMsg := buildManualTitleContext(tt.turns, tt.selected)

			if tt.wantConversationEmpty {
				require.Empty(t, conversationBlock)
			}
			if tt.wantConversation != "" {
				require.Equal(t, tt.wantConversation, conversationBlock)
			}
			if tt.wantConversationHasGap {
				require.Contains(t, conversationBlock, "[... 2 earlier turns omitted ...]")
			} else if !tt.wantConversationEmpty {
				require.NotContains(t, conversationBlock, "earlier turns omitted")
			}
			if tt.wantConversationRunes > 0 {
				require.Len(t, []rune(conversationBlock), tt.wantConversationRunes)
			}
			if tt.wantLatestUser != "" {
				require.Equal(t, tt.wantLatestUser, latestUserMsg)
			}
			if tt.wantLatestUserRunes > 0 {
				require.Len(t, []rune(latestUserMsg), tt.wantLatestUserRunes)
			}
			if tt.wantLatestUserContains != "" {
				require.Equal(t, tt.wantLatestUserContains, latestUserMsg)
			}
			if tt.wantLatestUserNotEmpty {
				require.NotEmpty(t, latestUserMsg)
			}
		})
	}
}

func Test_renderManualTitlePrompt(t *testing.T) {
	t.Parallel()

	longFirstUserText := strings.Repeat("b", 1501)

	tests := []struct {
		name                   string
		conversationBlock      string
		firstUserText          string
		latestUserMsg          string
		wantConversationSample bool
		wantLatestSection      bool
	}{
		{
			name:                   "includes conversation sample when provided",
			conversationBlock:      "[user]: inspect logs\n[assistant]: found flaky test",
			firstUserText:          "inspect logs",
			latestUserMsg:          "update quickgen title",
			wantConversationSample: true,
			wantLatestSection:      true,
		},
		{
			name:                   "omits optional sections when not needed",
			conversationBlock:      "",
			firstUserText:          "inspect logs",
			latestUserMsg:          "inspect logs",
			wantConversationSample: false,
			wantLatestSection:      false,
		},
		{
			name:                   "latest section compares trimmed text",
			conversationBlock:      "",
			firstUserText:          "inspect logs",
			latestUserMsg:          " inspect logs ",
			wantConversationSample: false,
			wantLatestSection:      false,
		},
		{
			name:                   "omits latest section when same message truncated",
			conversationBlock:      "",
			firstUserText:          longFirstUserText,
			latestUserMsg:          truncateRunes(longFirstUserText, 1000),
			wantConversationSample: false,
			wantLatestSection:      false,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()

			prompt := renderManualTitlePrompt(tt.conversationBlock, tt.firstUserText, tt.latestUserMsg)

			require.Contains(t, prompt, "Primary user objective:")
			require.Contains(t, prompt, "Requirements:")
			require.Contains(t, prompt, "- Return only the title text in 2-8 words.")
			require.Contains(t, prompt, "Do not answer the user or describe the title-writing task")
			require.Contains(t, prompt, "stay close to the user's wording")
			require.Contains(t, prompt, "same language as the user's messages")

			if tt.wantConversationSample {
				require.Contains(t, prompt, "Conversation sample:")
				require.Contains(t, prompt, tt.conversationBlock)
			} else {
				require.NotContains(t, prompt, "Conversation sample:")
			}

			if tt.wantLatestSection {
				require.Contains(t, prompt, "The user's most recent message:")
				require.Contains(t, prompt, "Note: Weight the overall conversation arc more heavily than just the latest message.")
				require.Contains(t, prompt, strings.TrimSpace(tt.latestUserMsg))
			} else {
				require.NotContains(t, prompt, "The user's most recent message:")
				require.NotContains(t, prompt, "Weight the overall conversation arc more heavily")
			}
		})
	}
}

func Test_titleInput(t *testing.T) {
	t.Parallel()

	pasteFileID := uuid.New()
	pasteContent := "pasted stack trace with details"
	pasteMessage := mustChatMessage(t, database.ChatMessageRoleUser, database.ChatMessageVisibilityBoth,
		codersdk.ChatMessageFile(pasteFileID, "text/plain", "pasted-text-2026-01-02-03-04-05.txt"),
	)
	textMessage := mustChatMessage(t, database.ChatMessageRoleUser, database.ChatMessageVisibilityBoth,
		codersdk.ChatMessageText("summarize build logs"),
	)

	tests := []struct {
		name      string
		chat      database.Chat
		messages  []database.ChatMessage
		pasteText map[uuid.UUID]string
		wantInput string
		wantOK    bool
	}{
		{
			name:      "text message with fallback title is eligible",
			chat:      database.Chat{Title: chatprompt.FallbackTitle("summarize build logs")},
			messages:  []database.ChatMessage{textMessage},
			wantInput: "summarize build logs",
			wantOK:    true,
		},
		{
			name:      "paste only message with resolved paste text is eligible",
			chat:      database.Chat{Title: chatprompt.FallbackTitle(pasteContent)},
			messages:  []database.ChatMessage{pasteMessage},
			pasteText: map[uuid.UUID]string{pasteFileID: pasteContent},
			wantInput: pasteContent,
			wantOK:    true,
		},
		{
			name:     "paste only message without resolved paste text is skipped",
			chat:     database.Chat{Title: "New Chat"},
			messages: []database.ChatMessage{pasteMessage},
			wantOK:   false,
		},
		{
			name:      "paste only message with user renamed title is skipped",
			chat:      database.Chat{Title: "my custom name"},
			messages:  []database.ChatMessage{pasteMessage},
			pasteText: map[uuid.UUID]string{pasteFileID: pasteContent},
			wantOK:    false,
		},
		{
			name: "assistant reply disables generation",
			chat: database.Chat{Title: chatprompt.FallbackTitle(pasteContent)},
			messages: []database.ChatMessage{
				pasteMessage,
				mustChatMessage(t, database.ChatMessageRoleAssistant, database.ChatMessageVisibilityBoth,
					codersdk.ChatMessageText("done"),
				),
			},
			pasteText: map[uuid.UUID]string{pasteFileID: pasteContent},
			wantOK:    false,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()

			input, ok := titleInput(tt.chat, tt.messages, tt.pasteText)
			require.Equal(t, tt.wantOK, ok)
			require.Equal(t, tt.wantInput, input)
		})
	}
}

func Test_titlePasteText(t *testing.T) {
	t.Parallel()

	pasteFileID := uuid.New()
	pasteMessage := mustChatMessage(t, database.ChatMessageRoleUser, database.ChatMessageVisibilityBoth,
		codersdk.ChatMessageFile(pasteFileID, "text/plain", "pasted-text-2026-01-02-03-04-05.txt"),
	)

	t.Run("skips fetch when user messages have text", func(t *testing.T) {
		t.Parallel()

		ctrl := gomock.NewController(t)
		// No GetChatFileDataPrefixesByIDs expectation: a fetch would
		// fail the test.
		db := dbmock.NewMockStore(ctrl)

		pasteText, err := titlePasteText(context.Background(), db, []database.ChatMessage{
			mustChatMessage(t, database.ChatMessageRoleUser, database.ChatMessageVisibilityBoth,
				codersdk.ChatMessageText("typed text"),
				codersdk.ChatMessageFile(pasteFileID, "text/plain", "pasted-text-2026-01-02-03-04-05.txt"),
			),
		})
		require.NoError(t, err)
		require.Nil(t, pasteText)
	})

	t.Run("resolves paste content for paste only user messages", func(t *testing.T) {
		t.Parallel()

		ctrl := gomock.NewController(t)
		db := dbmock.NewMockStore(ctrl)
		db.EXPECT().GetChatFileDataPrefixesByIDs(gomock.Any(), database.GetChatFileDataPrefixesByIDsParams{
			IDs:         []uuid.UUID{pasteFileID},
			PrefixBytes: chatprompt.TitlePasteBytePrefix,
		}).Return([]database.GetChatFileDataPrefixesByIDsRow{
			{ID: pasteFileID, DataPrefix: []byte("pasted content")},
		}, nil)

		pasteText, err := titlePasteText(context.Background(), db, []database.ChatMessage{pasteMessage})
		require.NoError(t, err)
		require.Equal(t, map[uuid.UUID]string{pasteFileID: "pasted content"}, pasteText)
	})

	t.Run("propagates fetch errors", func(t *testing.T) {
		t.Parallel()

		ctrl := gomock.NewController(t)
		db := dbmock.NewMockStore(ctrl)
		db.EXPECT().GetChatFileDataPrefixesByIDs(gomock.Any(), gomock.Any()).Return(nil, sql.ErrConnDone)

		_, err := titlePasteText(context.Background(), db, []database.ChatMessage{pasteMessage})
		require.ErrorIs(t, err, sql.ErrConnDone)
	})

	t.Run("ignores non synthetic file only messages", func(t *testing.T) {
		t.Parallel()

		ctrl := gomock.NewController(t)
		db := dbmock.NewMockStore(ctrl)

		pasteText, err := titlePasteText(context.Background(), db, []database.ChatMessage{
			mustChatMessage(t, database.ChatMessageRoleUser, database.ChatMessageVisibilityBoth,
				codersdk.ChatMessageFile(uuid.New(), "image/png", "photo.png"),
			),
		})
		require.NoError(t, err)
		require.Nil(t, pasteText)
	})
}

func TestMaybeGenerateChatTitlePreservesUpdatedAt(t *testing.T) {
	t.Parallel()

	db, _ := dbtestutil.NewDB(t)
	ctx := testutil.Context(t, testutil.WaitMedium)
	owner := dbgen.User(t, db, database.User{})
	org := dbgen.Organization(t, db, database.Organization{})
	dbgen.OrganizationMember(t, db, database.OrganizationMember{
		UserID:         owner.ID,
		OrganizationID: org.ID,
	})
	dbgen.ChatProvider(t, db, database.ChatProvider{
		Provider:             "openai",
		DisplayName:          "OpenAI",
		APIKey:               "test-key",
		Enabled:              true,
		CentralApiKeyEnabled: true,
	})
	modelConfig := dbgen.ChatModelConfig(t, db, database.ChatModelConfig{
		Model: "test-model",
	})

	userPrompt := "summarize failed workspace build logs"
	chat := dbgen.Chat(t, db, database.Chat{
		OrganizationID:    org.ID,
		OwnerID:           owner.ID,
		LastModelConfigID: modelConfig.ID,
		Title:             chatprompt.FallbackTitle(userPrompt),
		Status:            database.ChatStatusWaiting,
		ClientType:        database.ChatClientTypeUi,
	})

	expectedUpdatedAt := chat.UpdatedAt

	const wantTitle = "Failed workspace logs"
	model := &chattest.FakeModel{
		GenerateObjectFn: func(_ context.Context, call fantasy.ObjectCall) (*fantasy.ObjectResponse, error) {
			require.Equal(t, "propose_title", call.SchemaName)
			return &fantasy.ObjectResponse{
				Object: map[string]any{"title": wantTitle},
			}, nil
		},
	}

	message := mustChatMessage(
		t,
		database.ChatMessageRoleUser,
		database.ChatMessageVisibilityBoth,
		codersdk.ChatMessageText(userPrompt),
	)
	message.ID = 1

	logger := slogtest.Make(t, &slogtest.Options{IgnoreErrors: true})
	generated := &generatedChatTitle{}
	server := &Server{db: db}
	server.maybeGenerateChatTitle(
		ctx,
		chat,
		[]database.ChatMessage{message},
		nil,
		"openai",
		database.ChatModelConfig{Model: "test-model"},
		model,
		aiGatewayModelRoute{},
		modelBuildOptions{},
		generated,
		logger,
		nil,
	)

	fetched, err := db.GetChatByID(ctx, chat.ID)
	require.NoError(t, err)
	require.Equal(t, wantTitle, fetched.Title)
	require.True(t, fetched.UpdatedAt.Equal(expectedUpdatedAt),
		"updated_at = %s, want same instant as %s",
		fetched.UpdatedAt,
		expectedUpdatedAt,
	)

	gotTitle, ok := generated.Load()
	require.True(t, ok)
	require.Equal(t, wantTitle, gotTitle)
}

func TestMaybeGenerateChatTitleAppliesModelConfigReasoningEffort(t *testing.T) {
	t.Parallel()

	ctx := testutil.Context(t, testutil.WaitShort)
	chat, messages := titleOverrideTestChatAndMessages(t)
	reasoningEffort := "high"
	maxReasoningEffort := "max"
	modelConfigRaw, err := json.Marshal(codersdk.ChatModelCallConfig{
		ReasoningEffort: &codersdk.ChatModelReasoningEffortConfig{
			Default: &reasoningEffort,
			Max:     &maxReasoningEffort,
		},
	})
	require.NoError(t, err)

	model := &chattest.FakeModel{
		ProviderName: fantasyopenai.Name,
		ModelName:    "gpt-4o-mini",
		GenerateObjectFn: func(_ context.Context, call fantasy.ObjectCall) (*fantasy.ObjectResponse, error) {
			require.NotNil(t, call.MaxOutputTokens)
			require.Equal(t, int64(256), *call.MaxOutputTokens)
			providerOptions, ok := call.ProviderOptions[fantasyopenai.Name].(*fantasyopenai.ResponsesProviderOptions)
			require.True(t, ok, "%T", call.ProviderOptions[fantasyopenai.Name])
			require.NotNil(t, providerOptions.ReasoningEffort)
			require.Equal(t, fantasyopenai.ReasoningEffortHigh, *providerOptions.ReasoningEffort)
			return &fantasy.ObjectResponse{
				Object: map[string]any{"title": "Reasoning title"},
			}, nil
		},
	}

	db := dbmock.NewMockStore(gomock.NewController(t))
	db.EXPECT().GetChatTitleGenerationModelOverride(gomock.Any()).Return("", nil)
	db.EXPECT().UpdateChatTitleByID(gomock.Any(), database.UpdateChatTitleByIDParams{
		ID:    chat.ID,
		Title: "Reasoning title",
	}).Return(chatWithTitle(chat, "Reasoning title"), nil)

	logger := slogtest.Make(t, &slogtest.Options{IgnoreErrors: true})
	server := titleOverrideTestServer(db, logger)
	server.maybeGenerateChatTitle(
		ctx,
		chat,
		messages,
		nil,
		fantasyopenai.Name,
		database.ChatModelConfig{Model: "gpt-4o-mini", Options: modelConfigRaw},
		model,
		aiGatewayModelRoute{},
		modelBuildOptions{},
		&generatedChatTitle{},
		logger,
		nil,
	)
}

func Test_titleGenerationPrompt_UsesSlimRules(t *testing.T) {
	t.Parallel()

	require.Contains(t, titleGenerationPrompt, "Return only the title text in 2-8 words")
	require.Contains(t, titleGenerationPrompt, "Do not answer the user or describe the title-writing task")
	require.Contains(t, titleGenerationPrompt, "stay close to the user's wording")
	require.Contains(t, titleGenerationPrompt, "same language as the user's message")
	require.Contains(t, titleGenerationPrompt, "Examples:")
	require.NotContains(t, titleGenerationPrompt, "I am a title generator")
}

func Test_generateManualTitle_UsesTimeout(t *testing.T) {
	t.Parallel()

	messages := []database.ChatMessage{
		mustChatMessage(
			t,
			database.ChatMessageRoleUser,
			database.ChatMessageVisibilityBoth,
			codersdk.ChatMessageText("refresh chat title"),
		),
	}

	model := &chattest.FakeModel{
		GenerateObjectFn: func(ctx context.Context, call fantasy.ObjectCall) (*fantasy.ObjectResponse, error) {
			deadline, ok := ctx.Deadline()
			require.True(t, ok, "manual title generation should set a deadline")
			require.WithinDuration(
				t,
				time.Now().Add(30*time.Second),
				deadline,
				2*time.Second,
			)
			require.Len(t, call.Prompt, 2)
			require.Equal(t, "propose_title", call.SchemaName)
			return &fantasy.ObjectResponse{Object: map[string]any{"title": "Refresh title"}}, nil
		},
	}

	title, err := generateManualTitle(
		context.Background(),
		messages,
		nil,
		model,
		nil,
	)
	require.NoError(t, err)
	require.Equal(t, "Refresh title", title)
}

func Test_generateManualTitle_TruncatesFirstUserInput(t *testing.T) {
	t.Parallel()

	longFirstUserText := strings.Repeat("a", 1500)
	messages := []database.ChatMessage{
		mustChatMessage(
			t,
			database.ChatMessageRoleUser,
			database.ChatMessageVisibilityBoth,
			codersdk.ChatMessageText(longFirstUserText),
		),
	}

	model := &chattest.FakeModel{
		GenerateObjectFn: func(_ context.Context, call fantasy.ObjectCall) (*fantasy.ObjectResponse, error) {
			require.Len(t, call.Prompt, 2)
			systemText, ok := call.Prompt[0].Content[0].(fantasy.TextPart)
			require.True(t, ok)
			require.Contains(t, systemText.Text, truncateRunes(longFirstUserText, 1000))

			userText, ok := call.Prompt[1].Content[0].(fantasy.TextPart)
			require.True(t, ok)
			require.Equal(t, truncateRunes(longFirstUserText, 1000), userText.Text)
			return &fantasy.ObjectResponse{Object: map[string]any{"title": "Refresh title"}}, nil
		},
	}

	_, err := generateManualTitle(
		context.Background(),
		messages,
		nil,
		model,
		nil,
	)
	require.NoError(t, err)
}

func Test_generateManualTitle_ErrorsOnEmptyNormalizedTitle(t *testing.T) {
	t.Parallel()

	messages := []database.ChatMessage{
		mustChatMessage(
			t,
			database.ChatMessageRoleUser,
			database.ChatMessageVisibilityBoth,
			codersdk.ChatMessageText("refresh chat title"),
		),
	}

	model := &chattest.FakeModel{
		GenerateObjectFn: func(_ context.Context, _ fantasy.ObjectCall) (*fantasy.ObjectResponse, error) {
			return &fantasy.ObjectResponse{
				Object: map[string]any{"title": "\"\""},
				Usage: fantasy.Usage{
					InputTokens:  11,
					OutputTokens: 7,
					TotalTokens:  18,
				},
			}, nil
		},
	}

	_, err := generateManualTitle(
		context.Background(),
		messages,
		nil,
		model,
		nil,
	)
	require.ErrorContains(t, err, "generated title was empty")
}

func Test_selectPreferredConfiguredShortTextModelConfig(t *testing.T) {
	t.Parallel()

	t.Run("chooses the highest-priority configured lightweight model", func(t *testing.T) {
		t.Parallel()

		configs := []database.GetEnabledChatModelConfigsRow{
			{ChatModelConfig: database.ChatModelConfig{Model: preferredTitleModels[2].model}, Provider: preferredTitleModels[2].provider},
			{ChatModelConfig: database.ChatModelConfig{Model: preferredTitleModels[1].model}, Provider: preferredTitleModels[1].provider},
			{ChatModelConfig: database.ChatModelConfig{Model: "gpt-4.1"}, Provider: "openai"},
		}

		got, ok := selectPreferredConfiguredShortTextModelConfig(configs)
		require.True(t, ok)
		require.Equal(t, preferredTitleModels[1].model, got.Model)
	})

	t.Run("returns false when no preferred lightweight model is configured", func(t *testing.T) {
		t.Parallel()

		got, ok := selectPreferredConfiguredShortTextModelConfig([]database.GetEnabledChatModelConfigsRow{{
			ChatModelConfig: database.ChatModelConfig{Model: "gpt-4.1"},
			Provider:        "openai",
		}})
		require.False(t, ok)
		require.Equal(t, database.ChatModelConfig{}, got)
	})
}

func TestNormalizeTurnStatusLabel(t *testing.T) {
	t.Parallel()

	tests := []struct {
		name  string
		input string
		want  string
		ok    bool
	}{
		{name: "accepts short label", input: "Finished unit tests", want: "Finished unit tests", ok: true},
		{name: "accepts two word label", input: "Submitted PR", want: "Submitted PR", ok: true},
		{name: "trims quotes and trailing punctuation", input: `"Submitted PR."`, want: "Submitted PR", ok: true},
		{name: "keeps version punctuation", input: "Updated v2.1 config", want: "Updated v2.1 config", ok: true},
		{name: "accepts five word label", input: "Updated workspace proxy routing rules", want: "Updated workspace proxy routing rules", ok: true},
		{name: "rejects agent phrasing", input: "Agent identified failing tests", ok: false},
		{name: "rejects agent possessive", input: "Agent's findings reviewed", ok: false},
		{name: "rejects i contraction", input: "I've fixed tests", ok: false},
		{name: "rejects it contraction", input: "It's still running", ok: false},
		{name: "rejects we contraction", input: "We're almost done", ok: false},
		{name: "rejects agent phrase without prefix", input: "Found agent identified bugs", ok: false},
		{name: "rejects chat phrasing", input: "The chat is waiting now", ok: false},
		{name: "rejects multiline labels", input: "Fixed bug\nAdded tests", ok: false},
		{name: "rejects multi sentence labels", input: "Fixed bug. Added tests", ok: false},
		{name: "rejects single word", input: "Fixed", ok: false},
		{name: "rejects long labels", input: "Fixed the bug and added tests", ok: false},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()

			got, ok := normalizeTurnStatusLabel(tt.input)
			require.Equal(t, tt.ok, ok)
			require.Equal(t, tt.want, got)
		})
	}
}

func TestFallbackTurnStatusLabel(t *testing.T) {
	t.Parallel()

	tests := []struct {
		status database.ChatStatus
		want   string
	}{
		{status: database.ChatStatusWaiting, want: "Finished latest turn"},
		{status: database.ChatStatusPending, want: "Still working on request"},
		{status: database.ChatStatusRequiresAction, want: "Waiting for user input"},
		{status: database.ChatStatusError, want: "Hit an error"},
		{status: database.ChatStatus("unknown"), want: "Updated chat status"},
	}

	for _, tt := range tests {
		t.Run(string(tt.status), func(t *testing.T) {
			t.Parallel()
			require.Equal(t, tt.want, fallbackTurnStatusLabel(tt.status))
		})
	}
}

func TestGenerateStructuredTitleWithUsage_OpenAICompatibleRequiredToolChoice(t *testing.T) {
	t.Parallel()

	server, requests := newOpenAICompatStructuredOutputServer(t, "propose_title", `{"title":"Failed workspace logs"}`)
	model := openAICompatTestModel(t, server.URL)

	title, _, err := generateStructuredTitleWithUsage(
		t.Context(),
		model,
		nil,
		titleGenerationPrompt,
		"summarize failed workspace build logs",
	)
	require.NoError(t, err)
	require.Equal(t, "Failed workspace logs", title)

	body := testutil.TryReceive(t.Context(), t, requests)
	require.Equal(t, "required", body["tool_choice"])
	require.Equal(t, quickgenTemperature, body["temperature"],
		"title generation should pin temperature for repeatable output")
}

// newTemperatureRejectedError mirrors the bad-request error returned
// through AI Bridge by models that do not accept the temperature
// parameter.
func newTemperatureRejectedError() *fantasy.ProviderError {
	return &fantasy.ProviderError{
		Title: "bad request",
		Message: `POST "http://coder-aibridge/v1/messages": 400 Bad Request ` +
			`{"error":{"message":"` + "`temperature`" + ` is deprecated for this model.",` +
			`"type":"invalid_request_error"},"request_id":"","type":"error"}`,
		StatusCode: http.StatusBadRequest,
	}
}

func TestGenerateStructuredTitleWithUsage_DropsRejectedTemperature(t *testing.T) {
	t.Parallel()

	var sawTemperature []bool
	model := &chattest.FakeModel{
		GenerateObjectFn: func(_ context.Context, call fantasy.ObjectCall) (*fantasy.ObjectResponse, error) {
			sawTemperature = append(sawTemperature, call.Temperature != nil)
			if call.Temperature != nil {
				return nil, newTemperatureRejectedError()
			}
			return &fantasy.ObjectResponse{
				Object: map[string]any{"title": "Failed workspace logs"},
			}, nil
		},
	}

	title, _, err := generateStructuredTitleWithUsage(
		t.Context(),
		model,
		nil,
		titleGenerationPrompt,
		"summarize failed workspace build logs",
	)
	require.NoError(t, err)
	require.Equal(t, "Failed workspace logs", title)
	require.Equal(t, []bool{true, false}, sawTemperature,
		"generation should retry without temperature after the model rejects it")
}

func newOpenAICompatStructuredOutputServer(
	t *testing.T,
	toolName string,
	arguments string,
) (*httptest.Server, <-chan map[string]any) {
	t.Helper()

	requests := make(chan map[string]any, 10)
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		var body map[string]any
		if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
			http.Error(w, err.Error(), http.StatusBadRequest)
			return
		}
		requests <- body

		w.Header().Set("Content-Type", "application/json")
		_ = json.NewEncoder(w).Encode(map[string]any{
			"id":      "chatcmpl-structured-output",
			"object":  "chat.completion",
			"created": time.Now().Unix(),
			"model":   "anthropic/claude-4-5-sonnet",
			"choices": []map[string]any{
				{
					"index": 0,
					"message": map[string]any{
						"role":    "assistant",
						"content": "",
						"tool_calls": []map[string]any{
							{
								"id":   "call_structured_output",
								"type": "function",
								"function": map[string]any{
									"name":      toolName,
									"arguments": arguments,
								},
							},
						},
					},
					"finish_reason": "tool_calls",
				},
			},
			"usage": map[string]any{
				"prompt_tokens":     10,
				"completion_tokens": 5,
				"total_tokens":      15,
			},
		})
	}))
	t.Cleanup(server.Close)
	return server, requests
}

func openAICompatTestModel(t *testing.T, baseURL string) fantasy.LanguageModel {
	t.Helper()

	model, err := chatprovider.ModelFromConfig(
		fantasyopenaicompat.Name,
		"anthropic/claude-4-5-sonnet",
		chatprovider.ProviderAPIKeys{
			ByProvider: map[string]string{
				fantasyopenaicompat.Name: "test-key",
			},
			BaseURLByProvider: map[string]string{
				fantasyopenaicompat.Name: baseURL,
			},
		},
		chatprovider.UserAgent(),
		nil,
		nil,
	)
	require.NoError(t, err)
	return model
}

func TestGenerateStructuredTurnStatusLabel(t *testing.T) {
	t.Parallel()

	t.Run("returns compact label", func(t *testing.T) {
		t.Parallel()

		model := &chattest.FakeModel{
			GenerateObjectFn: func(_ context.Context, call fantasy.ObjectCall) (*fantasy.ObjectResponse, error) {
				require.Equal(t, "propose_turn_status_label", call.SchemaName)
				return &fantasy.ObjectResponse{
					Object: map[string]any{"label": "Submitted PR"},
				}, nil
			},
		}

		label, err := generateStructuredTurnStatusLabel(t.Context(), model, turnStatusLabelPrompt, "done")
		require.NoError(t, err)
		require.Equal(t, "Submitted PR", label)
	})

	t.Run("sends required tool_choice to openai-compatible provider", func(t *testing.T) {
		t.Parallel()

		server, requests := newOpenAICompatStructuredOutputServer(t, "propose_turn_status_label", `{"label":"Submitted PR"}`)
		model := openAICompatTestModel(t, server.URL)

		label, err := generateStructuredTurnStatusLabel(t.Context(), model, turnStatusLabelPrompt, "done")
		require.NoError(t, err)
		require.Equal(t, "Submitted PR", label)
		require.Len(t, requests, 1)

		body := testutil.TryReceive(t.Context(), t, requests)
		require.Equal(t, "required", body["tool_choice"])
		require.Equal(t, quickgenTemperature, body["temperature"],
			"status-label generation should pin temperature for repeatable output")
	})

	t.Run("drops temperature when model rejects it", func(t *testing.T) {
		t.Parallel()

		var sawTemperature []bool
		model := &chattest.FakeModel{
			GenerateObjectFn: func(_ context.Context, call fantasy.ObjectCall) (*fantasy.ObjectResponse, error) {
				sawTemperature = append(sawTemperature, call.Temperature != nil)
				if call.Temperature != nil {
					return nil, newTemperatureRejectedError()
				}
				return &fantasy.ObjectResponse{
					Object: map[string]any{"label": "Submitted PR"},
				}, nil
			},
		}

		label, err := generateStructuredTurnStatusLabel(t.Context(), model, turnStatusLabelPrompt, "done")
		require.NoError(t, err)
		require.Equal(t, "Submitted PR", label)
		require.Equal(t, []bool{true, false}, sawTemperature,
			"generation should retry without temperature after the model rejects it")
	})

	t.Run("surfaces unrelated bad request errors", func(t *testing.T) {
		t.Parallel()

		var calls int
		model := &chattest.FakeModel{
			GenerateObjectFn: func(_ context.Context, _ fantasy.ObjectCall) (*fantasy.ObjectResponse, error) {
				calls++
				return nil, &fantasy.ProviderError{
					Title:      "bad request",
					Message:    "tools.0.custom.input_schema: JSON schema is invalid",
					StatusCode: http.StatusBadRequest,
				}
			},
		}

		_, err := generateStructuredTurnStatusLabel(t.Context(), model, turnStatusLabelPrompt, "done")
		require.ErrorContains(t, err, "JSON schema is invalid")
		require.Equal(t, 1, calls,
			"bad requests unrelated to temperature should not trigger a second attempt")
	})

	t.Run("rejects narrative label", func(t *testing.T) {
		t.Parallel()

		model := &chattest.FakeModel{
			GenerateObjectFn: func(_ context.Context, _ fantasy.ObjectCall) (*fantasy.ObjectResponse, error) {
				return &fantasy.ObjectResponse{
					Object: map[string]any{"label": "Agent identified failing tests"},
				}, nil
			},
		}

		_, err := generateStructuredTurnStatusLabel(t.Context(), model, turnStatusLabelPrompt, "done")
		require.ErrorContains(t, err, "generated turn status label was invalid")
	})

	t.Run("rejects empty input", func(t *testing.T) {
		t.Parallel()

		model := &chattest.FakeModel{}
		_, err := generateStructuredTurnStatusLabel(t.Context(), model, turnStatusLabelPrompt, "  ")
		require.ErrorContains(t, err, "turn status label input was empty")
	})
}

func TestIsTemperatureRejectedError(t *testing.T) {
	t.Parallel()

	tests := []struct {
		name string
		err  error
		want bool
	}{
		{
			name: "nil error",
			err:  nil,
			want: false,
		},
		{
			name: "plain error mentioning temperature",
			err:  xerrors.New("temperature is deprecated for this model"),
			want: false,
		},
		{
			name: "bad request rejecting temperature",
			err:  newTemperatureRejectedError(),
			want: true,
		},
		{
			name: "wrapped bad request rejecting temperature",
			err:  xerrors.Errorf("tool-based generation failed: %w", newTemperatureRejectedError()),
			want: true,
		},
		{
			name: "bad request with temperature only in response body",
			err: &fantasy.ProviderError{
				Title:        "bad request",
				Message:      "provider request failed",
				StatusCode:   http.StatusBadRequest,
				ResponseBody: []byte(`{"error":{"message":"Unsupported parameter: 'temperature' is not supported with this model."}}`),
			},
			want: true,
		},
		{
			name: "bad request unrelated to temperature",
			err: &fantasy.ProviderError{
				Title:      "bad request",
				Message:    "tools.0.custom.input_schema: JSON schema is invalid",
				StatusCode: http.StatusBadRequest,
			},
			want: false,
		},
		{
			name: "server error mentioning temperature",
			err: &fantasy.ProviderError{
				Title:      "internal server error",
				Message:    "temperature processing failed",
				StatusCode: http.StatusInternalServerError,
			},
			want: false,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()
			require.Equal(t, tt.want, isTemperatureRejectedError(tt.err))
		})
	}
}

func mustChatMessage(
	t *testing.T,
	role database.ChatMessageRole,
	visibility database.ChatMessageVisibility,
	parts ...codersdk.ChatMessagePart,
) database.ChatMessage {
	t.Helper()

	content, err := json.Marshal(parts)
	require.NoError(t, err)

	return database.ChatMessage{
		Role:       role,
		Visibility: visibility,
		Content: pqtype.NullRawMessage{
			RawMessage: content,
			Valid:      len(content) > 0,
		},
	}
}