package askcli

import (
	"bytes"
	"context"
	"io"
	"path/filepath"
	"strings"
	"testing"
	"time"
)

func TestHandleList_Success(t *testing.T) {
	dir := t.TempDir()
	oldRoot := taskAliasCacheRoot
	oldNow := nowTaskAliasCache
	taskAliasCacheRoot = func() (string, error) { return filepath.Join(dir, "hexai"), nil }
	nowTaskAliasCache = func() time.Time { return time.Date(2026, 3, 26, 12, 0, 0, 0, time.UTC) }
	defer func() {
		taskAliasCacheRoot = oldRoot
		nowTaskAliasCache = oldNow
	}()

	writeTaskAliasCacheForTest(t, taskAliasCache{
		NextID: 2,
		Entries: []taskAliasCacheEntry{
			{UUID: "uuid-1", Alias: "0", CreatedAt: nowTaskAliasCache()},
			{UUID: "uuid-2", Alias: "1", CreatedAt: nowTaskAliasCache()},
		},
	})

	jsonData := `[{"uuid":"uuid-1","description":"Task 1","status":"pending","priority":"H","tags":["cli"],"start":"2026-03-26T10:00:00Z","urgency":15.0,"depends":[]},{"uuid":"uuid-2","description":"Task 2","status":"completed","priority":"M","tags":["agent"],"urgency":10.0,"depends":[]}]`
	d := NewDispatcher(&spyRunner{runFn: func(ctx context.Context, args []string, stdin io.Reader, stdout, stderr io.Writer) (int, error) {
		for _, arg := range args {
			if arg == "export" {
				io.WriteString(stdout, jsonData)
				return 0, nil
			}
		}
		return 0, nil
	}})
	var stdout, stderr bytes.Buffer
	code, _ := d.Dispatch(context.Background(), []string{"list"}, nil, &stdout, &stderr)
	if code != 0 {
		t.Fatalf("list code = %d, want 0", code)
	}
	output := stdout.String()
	if !strings.Contains(output, "ID") || strings.Contains(output, "UUID") {
		t.Fatalf("output should use ID column: %s", output)
	}
	if !strings.Contains(output, "0") || !strings.Contains(output, "1") || strings.Contains(output, "uuid-1") || strings.Contains(output, "uuid-2") {
		t.Fatalf("output missing aliases or leaking UUIDs: %s", output)
	}
	if !strings.Contains(output, "Started") || !strings.Contains(output, "yes") || !strings.Contains(output, "no") {
		t.Fatalf("output missing explicit started state: %s", output)
	}
}

func TestHandleList_SortedByPriority(t *testing.T) {
	dir := t.TempDir()
	oldRoot := taskAliasCacheRoot
	oldNow := nowTaskAliasCache
	taskAliasCacheRoot = func() (string, error) { return filepath.Join(dir, "hexai"), nil }
	nowTaskAliasCache = func() time.Time { return time.Date(2026, 3, 26, 12, 0, 0, 0, time.UTC) }
	defer func() {
		taskAliasCacheRoot = oldRoot
		nowTaskAliasCache = oldNow
	}()

	writeTaskAliasCacheForTest(t, taskAliasCache{
		NextID: 2,
		Entries: []taskAliasCacheEntry{
			{UUID: "uuid-1", Alias: "0", CreatedAt: nowTaskAliasCache()},
			{UUID: "uuid-2", Alias: "1", CreatedAt: nowTaskAliasCache()},
		},
	})

	jsonData := `[{"uuid":"uuid-2","description":"Task 2","status":"pending","priority":"M","tags":[],"urgency":10.0,"depends":[]},{"uuid":"uuid-1","description":"Task 1","status":"pending","priority":"H","tags":[],"urgency":5.0,"depends":[]}]`
	d := NewDispatcher(&spyRunner{runFn: func(ctx context.Context, args []string, stdin io.Reader, stdout, stderr io.Writer) (int, error) {
		for _, arg := range args {
			if arg == "export" {
				io.WriteString(stdout, jsonData)
				return 0, nil
			}
		}
		return 0, nil
	}})
	var stdout bytes.Buffer
	d.Dispatch(context.Background(), []string{"list"}, nil, &stdout, &bytes.Buffer{})
	output := stdout.String()
	lines := strings.Split(strings.TrimSpace(output), "\n")
	taskLine1 := lines[2]
	if !strings.Contains(taskLine1, "0") || strings.Contains(taskLine1, "uuid-1") {
		t.Fatalf("first task should be H priority alias 0, got: %s", taskLine1)
	}
}

func TestHandleList_EmptyList(t *testing.T) {
	d := NewDispatcher(&spyRunner{runFn: func(ctx context.Context, args []string, stdin io.Reader, stdout, stderr io.Writer) (int, error) {
		for _, arg := range args {
			if arg == "export" {
				io.WriteString(stdout, "[]")
				return 0, nil
			}
		}
		return 0, nil
	}})
	var stdout, stderr bytes.Buffer
	code, _ := d.Dispatch(context.Background(), []string{"list"}, nil, &stdout, &stderr)
	if code != 0 {
		t.Fatalf("list code = %d, want 0 for empty list", code)
	}
}

func TestHandleAll_Success(t *testing.T) {
	dir := t.TempDir()
	oldRoot := taskAliasCacheRoot
	oldNow := nowTaskAliasCache
	taskAliasCacheRoot = func() (string, error) { return filepath.Join(dir, "hexai"), nil }
	nowTaskAliasCache = func() time.Time { return time.Date(2026, 3, 26, 12, 0, 0, 0, time.UTC) }
	defer func() {
		taskAliasCacheRoot = oldRoot
		nowTaskAliasCache = oldNow
	}()

	writeTaskAliasCacheForTest(t, taskAliasCache{
		NextID: 1,
		Entries: []taskAliasCacheEntry{
			{UUID: "uuid-1", Alias: "0", CreatedAt: nowTaskAliasCache()},
		},
	})

	jsonData := `[{"uuid":"uuid-1","description":"Done task","status":"completed","priority":"M","tags":[],"urgency":0.0,"depends":[]}]`
	d := NewDispatcher(&spyRunner{runFn: func(ctx context.Context, args []string, stdin io.Reader, stdout, stderr io.Writer) (int, error) {
		for _, arg := range args {
			if arg == "export" {
				io.WriteString(stdout, jsonData)
				return 0, nil
			}
		}
		return 0, nil
	}})
	var stdout, stderr bytes.Buffer
	code, _ := d.Dispatch(context.Background(), []string{"all"}, nil, &stdout, &stderr)
	if code != 0 {
		t.Fatalf("all code = %d, want 0", code)
	}
	if !strings.Contains(stdout.String(), "0") || strings.Contains(stdout.String(), "uuid-1") {
		t.Fatalf("output should show alias only: %s", stdout.String())
	}
}

func TestHandleReady_Success(t *testing.T) {
	dir := t.TempDir()
	oldRoot := taskAliasCacheRoot
	oldNow := nowTaskAliasCache
	taskAliasCacheRoot = func() (string, error) { return filepath.Join(dir, "hexai"), nil }
	nowTaskAliasCache = func() time.Time { return time.Date(2026, 3, 26, 12, 0, 0, 0, time.UTC) }
	defer func() {
		taskAliasCacheRoot = oldRoot
		nowTaskAliasCache = oldNow
	}()

	writeTaskAliasCacheForTest(t, taskAliasCache{
		NextID: 1,
		Entries: []taskAliasCacheEntry{
			{UUID: "uuid-ready", Alias: "0", CreatedAt: nowTaskAliasCache()},
		},
	})

	jsonData := `[{"uuid":"uuid-ready","description":"Ready task","status":"pending","priority":"H","tags":["READY"],"urgency":20.0,"depends":[]}]`
	d := NewDispatcher(&spyRunner{runFn: func(ctx context.Context, args []string, stdin io.Reader, stdout, stderr io.Writer) (int, error) {
		for _, arg := range args {
			if arg == "export" {
				io.WriteString(stdout, jsonData)
				return 0, nil
			}
		}
		return 0, nil
	}})
	var stdout, stderr bytes.Buffer
	code, _ := d.Dispatch(context.Background(), []string{"ready"}, nil, &stdout, &stderr)
	if code != 0 {
		t.Fatalf("ready code = %d, want 0", code)
	}
	if !strings.Contains(stdout.String(), "0") || strings.Contains(stdout.String(), "uuid-ready") {
		t.Fatalf("output should show alias only: %s", stdout.String())
	}
}

func TestHandleList_PassesFilters(t *testing.T) {
	var capturedArgs []string
	d := NewDispatcher(&spyRunner{runFn: func(ctx context.Context, args []string, stdin io.Reader, stdout, stderr io.Writer) (int, error) {
		capturedArgs = args
		io.WriteString(stdout, "[]")
		return 0, nil
	}})
	var stdout, stderr bytes.Buffer
	d.Dispatch(context.Background(), []string{"list", "+READY", "limit:5", "sort:priority-"}, nil, &stdout, &stderr)
	if len(capturedArgs) < 2 {
		t.Fatalf("expected export args, got %v", capturedArgs)
	}
	hasExport := false
	for _, arg := range capturedArgs {
		if arg == "export" {
			hasExport = true
			break
		}
	}
	if !hasExport {
		t.Fatalf("expected export in args, got %v", capturedArgs)
	}
}