package service

import (
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"github.com/tcs-iptv/tcs/internal/chain"
	"github.com/tcs-iptv/tcs/internal/macode"
	"github.com/tcs-iptv/tcs/internal/model"
)

// 24 集微短剧：一剧一 MA 码，每集独立哈希，可按集验真。
func TestEpisodeLevel_OneSeriesOneCodeMultiEpisodeHash(t *testing.T) {
	s := newService(t)

	eps := make([]model.EpisodeHash, 0, 24)
	for i := 1; i <= 24; i++ {
		eps = append(eps, model.EpisodeHash{
			Episode:    i,
			FileSHA256: "ep-hash-" + string(rune('a'+i)),
			MerkleRoot: "ep-mr-" + string(rune('a'+i)),
			Duration:   180,
		})
	}
	sub := Submission{
		Title: "长安少年行", EpisodeCount: 24, Category: macode.CategoryMicroDrama,
		FileHash: "series-root-hash", MerkleRoot: "series-merkle-root",
		Episodes:  eps,
		CPMediaID: "XAQJSL-2026-001", CPName: "西安曲江丝路文化传播有限公司",
	}
	r, err := s.SubmitForReview(sub)
	require.NoError(t, err)
	require.NoError(t, s.ReviewCSPS(r.ReviewID, true, "rv-1"))
	issued, err := s.ApproveAndIssue(chain.RoleRegulator, r.ReviewID, "陕西IPTV运营公司")
	require.NoError(t, err)

	// 一剧一码
	assert.True(t, macode.IsValid(issued.MACode))

	// 24 集哈希全部绑定在同一 MA 码下
	list, err := s.ListEpisodes(issued.MACode)
	require.NoError(t, err)
	assert.Len(t, list, 24)

	// 按集验真：第 7 集正确哈希匹配
	res, err := s.VerifyEpisode(issued.MACode, 7, "ep-hash-"+string(rune('a'+7)))
	require.NoError(t, err)
	assert.True(t, res.Match)

	// 第 7 集错误哈希 → 不匹配（疑似该集被替换）
	_, err = s.VerifyEpisode(issued.MACode, 7, "tampered-ep7")
	assert.ErrorIs(t, err, ErrHashMismatch)
}

// 集级下架：只下架第3集，整剧其他集不受影响。
func TestEpisodeTakedown(t *testing.T) {
	s := newService(t)

	eps := []model.EpisodeHash{
		{Episode: 1, FileSHA256: "h1"}, {Episode: 2, FileSHA256: "h2"},
		{Episode: 3, FileSHA256: "h3"}, {Episode: 4, FileSHA256: "h4"},
	}
	sub := Submission{
		Title: "多集剧", EpisodeCount: 4, Category: macode.CategoryMicroDrama,
		FileHash: "series-h", MerkleRoot: "series-mr", Episodes: eps,
	}
	r, err := s.SubmitForReview(sub)
	require.NoError(t, err)
	require.NoError(t, s.ReviewCSPS(r.ReviewID, true, "rv-1"))
	issued, err := s.ApproveAndIssue(chain.RoleRegulator, r.ReviewID, "陕西IPTV运营公司")
	require.NoError(t, err)

	// 运营商无权集级下架
	err = s.TakedownEpisode(chain.RoleOperator, issued.MACode, 3, "第3集违规")
	assert.ErrorIs(t, err, chain.ErrPermissionDenied)

	// 监管下架第3集
	require.NoError(t, s.TakedownEpisode(chain.RoleRegulator, issued.MACode, 3, "第3集违规"))

	list, err := s.ListEpisodes(issued.MACode)
	require.NoError(t, err)
	for _, b := range list {
		if b.Episode == 3 {
			assert.True(t, b.Revoked, "第3集应已下架")
		} else {
			assert.False(t, b.Revoked, "第%d集不应受影响", b.Episode)
		}
	}
}

// 集级子标识：MA码#E07 解析与生成。
func TestEpisodeSubID(t *testing.T) {
	ma := "MA.156.8531.6101/WD/20260000001"
	sub := macode.EpisodeSubID(ma, 7)
	assert.Equal(t, "MA.156.8531.6101/WD/20260000001#E07", sub)

	parsedMA, ep := macode.ParseEpisodeSubID(sub)
	assert.Equal(t, ma, parsedMA)
	assert.Equal(t, 7, ep)

	// 无后缀 → 整剧（episode 0）
	parsedMA2, ep2 := macode.ParseEpisodeSubID(ma)
	assert.Equal(t, ma, parsedMA2)
	assert.Equal(t, 0, ep2)
}

// 单体内容（电影，无分集）：episodes 为空也能正常签发与整剧验真。
func TestSingleContent_NoEpisodes(t *testing.T) {
	s := newService(t)
	sub := sampleSub()
	sub.Episodes = nil
	r, err := s.SubmitForReview(sub)
	require.NoError(t, err)
	require.NoError(t, s.ReviewCSPS(r.ReviewID, true, "rv-1"))
	issued, err := s.ApproveAndIssue(chain.RoleRegulator, r.ReviewID, "陕西IPTV运营公司")
	require.NoError(t, err)

	list, err := s.ListEpisodes(issued.MACode)
	require.NoError(t, err)
	assert.Empty(t, list, "单体内容无集级绑定")

	// 整剧验真仍可用
	res, err := s.Verify(issued.MACode, sub.FileHash)
	require.NoError(t, err)
	assert.True(t, res.Match)
}