package analyst

import (
	"context"
	"errors"
	"testing"

	"github.com/kamelion/ratatoskr-go/internal/core"
	"github.com/kamelion/ratatoskr-go/internal/opencode"
	"github.com/kamelion/ratatoskr-go/internal/storage"
)

// mockRunner — тестовый OpenCodeRunner с задаваемым поведением.
type mockRunner struct {
	result *opencode.Result
	err    error
}

func (m *mockRunner) Run(_ context.Context, _, _, _, _ string) (*opencode.Result, error) {
	return m.result, m.err
}

func TestDecideAsk(t *testing.T) {
	a := &Analyst{Runner: &mockRunner{result: &opencode.Result{
		RC: 0,
		Stdout: `{"type":"text","part":{"text":"{\"phase\":\"ask\",\"chat_reply\":\"Уточню про репозиторий\",\"questions\":[\"Где лежит код?\",\"Какая цель?\"]}"}}`,
	}}, Worktree: "/tmp"}

	history := []core.Message{{Role: "user", Content: "Сделай калькулятор"}}
	dec, err := a.Decide(context.Background(), history, storage.Task{}, false)
	if err != nil {
		t.Fatalf("Decide err: %v", err)
	}
	if dec.Phase != "ask" {
		t.Errorf("Phase = %q, want ask", dec.Phase)
	}
	if len(dec.Questions) != 2 {
		t.Errorf("len(Questions) = %d, want 2", len(dec.Questions))
	}
	if dec.ChatReply == "" {
		t.Error("ChatReply пустой")
	}
}

func TestDecidePropose(t *testing.T) {
	a := &Analyst{Runner: &mockRunner{result: &opencode.Result{
		RC: 0,
		Stdout: `{"type":"text","part":{"text":"{\"phase\":\"propose\",\"title\":\"Калькулятор\",\"goal\":\"Сделать веб-калькулятор\",\"repo\":\"tools/calc\",\"why\":\"Нужен для учёта\",\"ac\":\"Работает + - * /\",\"chat_reply\":\"Готово!\"}"}}`,
	}}, Worktree: "/tmp"}

	history := []core.Message{
		{Role: "user", Content: "Сделай калькулятор"},
		{Role: "assistant", Content: "Где репозиторий?"},
		{Role: "user", Content: "tools/calc"},
	}
	dec, err := a.Decide(context.Background(), history, storage.Task{}, false)
	if err != nil {
		t.Fatalf("Decide err: %v", err)
	}
	if dec.Phase != "propose" {
		t.Errorf("Phase = %q, want propose", dec.Phase)
	}
	if dec.Draft.Title != "Калькулятор" {
		t.Errorf("Draft.Title = %q, want Калькулятор", dec.Draft.Title)
	}
	if dec.Draft.Repo != "tools/calc" {
		t.Errorf("Draft.Repo = %q", dec.Draft.Repo)
	}
}

func TestDecideAbort(t *testing.T) {
	a := &Analyst{Runner: &mockRunner{result: &opencode.Result{
		RC: 0,
		Stdout: `{"type":"text","part":{"text":"{\"phase\":\"abort\",\"chat_reply\":\"Это не про код.\",\"abort_reason\":\"Тема не подходит opencode\"}"}}`,
	}}, Worktree: "/tmp"}

	history := []core.Message{{Role: "user", Content: "Почини принтер"}}
	dec, err := a.Decide(context.Background(), history, storage.Task{}, false)
	if err != nil {
		t.Fatalf("Decide err: %v", err)
	}
	if dec.Phase != "abort" {
		t.Errorf("Phase = %q, want abort", dec.Phase)
	}
	if dec.ChatReply != "Это не про код." {
		t.Errorf("ChatReply = %q", dec.ChatReply)
	}
}

func TestDecodeFail(t *testing.T) {
	a := &Analyst{Runner: &mockRunner{result: &opencode.Result{
		RC:     0,
		Stdout: `{"type":"text","part":{"text":"не JSON, а просто текст"}}`,
	}}, Worktree: "/tmp"}

	history := []core.Message{{Role: "user", Content: "тест"}}
	_, err := a.Decide(context.Background(), history, storage.Task{}, false)
	if err == nil {
		t.Fatal("expected A1 error")
	}
	if !errors.Is(err, ErrDecodeFail) {
		t.Errorf("err = %v, want A1", err)
	}
}

func TestRunError(t *testing.T) {
	a := &Analyst{Runner: &mockRunner{err: errors.New("opencode not found")}, Worktree: "/tmp"}
	history := []core.Message{{Role: "user", Content: "тест"}}
	_, err := a.Decide(context.Background(), history, storage.Task{}, false)
	if err == nil {
		t.Fatal("expected A2 error")
	}
	if !errors.Is(err, ErrRunError) {
		t.Errorf("err = %v, want A2", err)
	}
}

func TestEmptyHistory(t *testing.T) {
	a := &Analyst{Runner: &mockRunner{result: &opencode.Result{RC: 0}}}
	_, err := a.Decide(context.Background(), nil, storage.Task{}, false)
	if err == nil {
		t.Fatal("expected A4 error")
	}
	if !errors.Is(err, ErrNotReady) {
		t.Errorf("err = %v, want A4", err)
	}
}

func TestForceEmptyHistory(t *testing.T) {
	a := &Analyst{Runner: &mockRunner{result: &opencode.Result{
		RC: 0,
		Stdout: `{"type":"text","part":{"text":"{\"phase\":\"ask\",\"chat_reply\":\"Опишите задачу.\"}"}}`,
	}}, Worktree: "/tmp"}

	_, err := a.Decide(context.Background(), nil, storage.Task{}, true)
	if err != nil {
		t.Fatalf("Decide(force=true) err: %v", err)
	}
}

func TestInvalidPhase(t *testing.T) {
	a := &Analyst{Runner: &mockRunner{result: &opencode.Result{
		RC: 0,
		Stdout: `{"type":"text","part":{"text":"{\"phase\":\"unknown\"}"}}`,
	}}, Worktree: "/tmp"}

	history := []core.Message{{Role: "user", Content: "test"}}
	_, err := a.Decide(context.Background(), history, storage.Task{}, false)
	if err == nil {
		t.Fatal("expected A3 error")
	}
	if !errors.Is(err, ErrValidation) {
		t.Errorf("err = %v, want A3", err)
	}
}

func TestNonZeroExit(t *testing.T) {
	a := &Analyst{Runner: &mockRunner{result: &opencode.Result{RC: 1, Stdout: "fail"}}, Worktree: "/tmp"}
	history := []core.Message{{Role: "user", Content: "test"}}
	_, err := a.Decide(context.Background(), history, storage.Task{}, false)
	if err == nil {
		t.Fatal("expected A2 error for rc=1")
	}
	if !errors.Is(err, ErrRunError) {
		t.Errorf("err = %v, want A2", err)
	}
}

func TestProposeEmptyFields(t *testing.T) {
	// propose без изменённых полей — A3
	a := &Analyst{Runner: &mockRunner{result: &opencode.Result{
		RC: 0,
		Stdout: `{"type":"text","part":{"text":"{\"phase\":\"propose\",\"chat_reply\":\"ok\"}"}}`,
	}}, Worktree: "/tmp"}

	history := []core.Message{{Role: "user", Content: "test"}}
	_, err := a.Decide(context.Background(), history, storage.Task{}, false)
	if err == nil {
		t.Fatal("expected A3 error for propose with no fields")
	}
	if !errors.Is(err, ErrValidation) {
		t.Errorf("err = %v, want A3", err)
	}
}

func TestAskEmptyReplyAndQuestions(t *testing.T) {
	// ask без chat_reply и questions — A3
	a := &Analyst{Runner: &mockRunner{result: &opencode.Result{
		RC: 0,
		Stdout: `{"type":"text","part":{"text":"{\"phase\":\"ask\"}"}}`,
	}}, Worktree: "/tmp"}

	history := []core.Message{{Role: "user", Content: "test"}}
	_, err := a.Decide(context.Background(), history, storage.Task{}, false)
	if err == nil {
		t.Fatal("expected A3 error for empty ask")
	}
	if !errors.Is(err, ErrValidation) {
		t.Errorf("err = %v, want A3", err)
	}
}