// Copyright 2026 tamakyi. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.

package db

import (
	"context"
	"testing"

	"github.com/stretchr/testify/require"
)

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

	db, cleanup := newTestDB(t)
	ctx := context.Background()

	store := NewVoteOptionsStore(db)

	for _, tc := range []struct {
		name string
		test func(t *testing.T, ctx context.Context, db *voteOptions)
	}{
		{"Create", testVoteOptionsCreate},
		{"BulkCreate", testVoteOptionsBulkCreate},
		{"ListByVoteID", testVoteOptionsListByVoteID},
		{"DeleteByID", testVoteOptionsDeleteByID},
		{"DeleteByVoteID", testVoteOptionsDeleteByVoteID},
		{"CountByVoteID", testVoteOptionsCountByVoteID},
	} {
		t.Run(tc.name, func(t *testing.T) {
			t.Cleanup(func() {
				if err := cleanup("vote_options"); err != nil {
					t.Fatal(err)
				}
			})
			tc.test(t, ctx, store.(*voteOptions))
		})
	}
}

func testVoteOptionsCreate(t *testing.T, ctx context.Context, db *voteOptions) {
	got, err := db.Create(ctx, CreateVoteOptionOptions{
		VoteID:    1,
		Content:   "选项 A",
		SortOrder: 0,
	})
	require.Nil(t, err)
	require.Equal(t, uint(1), got.ID)
	require.Equal(t, "选项 A", got.Content)
}

func testVoteOptionsBulkCreate(t *testing.T, ctx context.Context, db *voteOptions) {
	got, err := db.BulkCreate(ctx, 1, []string{"A", "B", "C"})
	require.Nil(t, err)
	require.Len(t, got, 3)

	// SortOrder 应按传入顺序从 0 递增
	require.Equal(t, 0, got[0].SortOrder)
	require.Equal(t, 2, got[2].SortOrder)
	require.Equal(t, "C", got[2].Content)
}

func testVoteOptionsListByVoteID(t *testing.T, ctx context.Context, db *voteOptions) {
	_, err := db.BulkCreate(ctx, 1, []string{"B", "A", "C"})
	require.Nil(t, err)
	_, err = db.BulkCreate(ctx, 2, []string{"X"})
	require.Nil(t, err)

	got, err := db.ListByVoteID(ctx, 1)
	require.Nil(t, err)
	require.Len(t, got, 3)
	require.Equal(t, "B", got[0].Content, "按 SortOrder 升序：B(sort 0), A(sort 1), C(sort 2)")
	require.Equal(t, "C", got[2].Content)
}

func testVoteOptionsDeleteByID(t *testing.T, ctx context.Context, db *voteOptions) {
	_, err := db.Create(ctx, CreateVoteOptionOptions{VoteID: 1, Content: "A"})
	require.Nil(t, err)

	t.Run("normal", func(t *testing.T) {
		require.Nil(t, db.DeleteByID(ctx, 1))
		got, err := db.ListByVoteID(ctx, 1)
		require.Nil(t, err)
		require.Len(t, got, 0)
	})

	t.Run("not found", func(t *testing.T) {
		require.Equal(t, ErrVoteOptionNotExist, db.DeleteByID(ctx, 404))
	})
}

func testVoteOptionsDeleteByVoteID(t *testing.T, ctx context.Context, db *voteOptions) {
	_, err := db.BulkCreate(ctx, 1, []string{"A", "B", "C"})
	require.Nil(t, err)

	require.Nil(t, db.DeleteByVoteID(ctx, 1))
	got, err := db.ListByVoteID(ctx, 1)
	require.Nil(t, err)
	require.Len(t, got, 0)
}

func testVoteOptionsCountByVoteID(t *testing.T, ctx context.Context, db *voteOptions) {
	_, err := db.BulkCreate(ctx, 1, []string{"A", "B"})
	require.Nil(t, err)

	got, err := db.CountByVoteID(ctx, 1)
	require.Nil(t, err)
	require.Equal(t, int64(2), got)

	got, err = db.CountByVoteID(ctx, 404)
	require.Nil(t, err)
	require.Equal(t, int64(0), got)
}

// TestVoteOptionMaxLengthRoundTrip 保证「配置允许的长度」真的能存下。
//
// 曾经 conf 允许 300 字而列宽只有 200：201–300 字的选项通过校验后在写库时才失败
// （PostgreSQL 报 value too long，MySQL 严格模式同样报错），用户看到的是「内部错误」。
func TestVoteOptionMaxLengthRoundTrip(t *testing.T) {
	conn, cleanup := newTestDB(t)
	t.Cleanup(func() {
		if err := cleanup("vote_options"); err != nil {
			t.Fatal(err)
		}
	})

	ctx := context.Background()
	store := NewVoteOptionsStore(conn)

	// 结构体标签不能引用常量，列宽与 MaxVoteOptionLen 是两处独立字面量，
	// 这里显式比一次，防止只改了一边。
	columns, err := conn.Migrator().ColumnTypes(&VoteOption{})
	require.Nil(t, err)
	for _, ct := range columns {
		if ct.Name() != "content" {
			continue
		}
		if length, ok := ct.Length(); ok {
			require.EqualValues(t, MaxVoteOptionLen, length, "vote_options.content 列宽必须与 MaxVoteOptionLen 一致")
		}
	}

	// 用多字节字符填满上限，顺便验证按字符而非字节计数。
	content := ""
	for len([]rune(content)) < MaxVoteOptionLen {
		content += "選"
	}

	option, err := store.Create(ctx, CreateVoteOptionOptions{VoteID: 1, Content: content})
	require.Nil(t, err)

	got, err := store.ListByVoteID(ctx, 1)
	require.Nil(t, err)
	require.Len(t, got, 1)
	require.Equal(t, option.ID, got[0].ID)
	require.Equal(t, MaxVoteOptionLen, len([]rune(got[0].Content)), "存进去的字符数应与上限一致，未被截断")
}

// TestVoteOptionColumnWidens 验证老库升级路径：已经存在 varchar(200) 的列，
// 跑一次 AutoMigrate 后必须变成 MaxVoteOptionLen。
//
// 只改 model 标签是不够的 —— 如果 AutoMigrate 不扩列，老部署上线后
// 201–300 字的选项依旧写不进去，而新库（测试库）永远发现不了这个问题。
func TestVoteOptionColumnWidens(t *testing.T) {
	conn, cleanup := newTestDB(t)
	t.Cleanup(func() {
		if err := cleanup("vote_options"); err != nil {
			t.Fatal(err)
		}
	})

	// 退回老库的列宽（两种方言语法不同）。
	var alter string
	switch conn.Dialector.Name() {
	case "postgres":
		alter = "ALTER TABLE vote_options ALTER COLUMN content TYPE varchar(200)"
	case "mysql":
		alter = "ALTER TABLE vote_options MODIFY COLUMN content varchar(200)"
	default:
		t.Skipf("未适配的方言：%s", conn.Dialector.Name())
	}
	require.Nil(t, conn.Exec(alter).Error)

	contentLength := func() int64 {
		columns, err := conn.Migrator().ColumnTypes(&VoteOption{})
		require.Nil(t, err)
		for _, ct := range columns {
			if ct.Name() != "content" {
				continue
			}
			length, ok := ct.Length()
			require.True(t, ok, "content 列应有明确长度")
			return length
		}
		t.Fatal("未找到 content 列")
		return 0
	}
	require.EqualValues(t, 200, contentLength(), "前置条件：列宽应已被改回 200")

	require.Nil(t, conn.AutoMigrate(&VoteOption{}))
	require.EqualValues(t, MaxVoteOptionLen, contentLength(), "AutoMigrate 必须把列宽扩到 MaxVoteOptionLen")
}