package service

import (
	"strings"
	"testing"

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

func newService(t *testing.T) *Service {
	t.Helper()
	gen := cccode.NewGenerator(cccode.NewMemoryStore())
	require.NoError(t, gen.RegisterSegment(cccode.Segment{
		IndustryNode: "8531", OrgNode: "4401",
		Category: cccode.CategoryMicroDrama, Start: 1, End: 100, SeqWidth: 7,
	}))
	return New(chain.NewMemoryChain(), gen)
}

func sampleSub() Submission {
	return Submission{
		Title: "示例微短剧", EpisodeCount: 24, Category: cccode.CategoryMicroDrama,
		FileHash: "filehash-abc", MerkleRoot: "merkle-abc", Perceptual: "phash-abc",
		CPMediaID: "FS-MEDIA-77821", CPName: "飞翮信息",
	}
}

func TestSubmit_IncompleteHashRejected(t *testing.T) {
	s := newService(t)
	_, err := s.SubmitForReview(Submission{Title: "无哈希", Category: cccode.CategoryMicroDrama})
	assert.ErrorIs(t, err, ErrIncompleteHashPkg)
}

func TestSubmit_Success(t *testing.T) {
	s := newService(t)
	res, err := s.SubmitForReview(sampleSub())
	require.NoError(t, err)
	assert.NotEmpty(t, res.ReviewID)
	assert.NotEmpty(t, res.ContentTwinID)
	assert.Equal(t, "pending", res.Status)
}

func TestApproveAndIssue_GeneratesCCCode(t *testing.T) {
	s := newService(t)
	sub, err := s.SubmitForReview(sampleSub())
	require.NoError(t, err)
	require.NoError(t, s.ReviewCSPS(sub.ReviewID, true, "rv-1"))

	issued, err := s.ApproveAndIssue(chain.RoleRegulator, sub.ReviewID, "北京市广播电视局")
	require.NoError(t, err)
	// 模式B：MA 码由系统按号段生成
	assert.True(t, cccode.IsValid(issued.CCCode), "应生成合法 MA 码: %s", issued.CCCode)
	assert.True(t, strings.HasPrefix(issued.CCCode, "MA.156.8531.4401/WD/"), "前缀应匹配号段: %s", issued.CCCode)
	assert.NotEmpty(t, issued.TxID)
	assert.Contains(t, issued.Certificate, issued.CCCode)
}

func TestApproveAndIssue_OnlyRegulator(t *testing.T) {
	s := newService(t)
	sub, _ := s.SubmitForReview(sampleSub())
	require.NoError(t, s.ReviewCSPS(sub.ReviewID, true, "rv-1")) // 先过审，才轮到校验角色
	_, err := s.ApproveAndIssue(chain.RoleCP, sub.ReviewID, "x")
	assert.ErrorIs(t, err, chain.ErrPermissionDenied)
}

func TestSubmit_DuplicateRejectedAfterIssue(t *testing.T) {
	s := newService(t)
	sub, _ := s.SubmitForReview(sampleSub())
	require.NoError(t, s.ReviewCSPS(sub.ReviewID, true, "rv-1"))
	_, err := s.ApproveAndIssue(chain.RoleRegulator, sub.ReviewID, "issuer")
	require.NoError(t, err)

	// 同哈希再次送审 → 换壳重发拦截
	_, err = s.SubmitForReview(sampleSub())
	assert.ErrorIs(t, err, ErrDuplicateContent)
}

func TestVerify_MatchAndMismatch(t *testing.T) {
	s := newService(t)
	sub, _ := s.SubmitForReview(sampleSub())
	require.NoError(t, s.ReviewCSPS(sub.ReviewID, true, "rv-1"))
	issued, _ := s.ApproveAndIssue(chain.RoleRegulator, sub.ReviewID, "issuer")

	res, err := s.Verify(issued.CCCode, "filehash-abc")
	require.NoError(t, err)
	assert.True(t, res.Match)

	_, err = s.Verify(issued.CCCode, "tampered")
	assert.ErrorIs(t, err, ErrHashMismatch)
}

func TestApproveAndIssue_TwoContentsUniqueCodes(t *testing.T) {
	s := newService(t)
	sub1, _ := s.SubmitForReview(sampleSub())
	require.NoError(t, s.ReviewCSPS(sub1.ReviewID, true, "rv-1"))
	i1, err := s.ApproveAndIssue(chain.RoleRegulator, sub1.ReviewID, "issuer")
	require.NoError(t, err)

	sub2v := sampleSub()
	sub2v.FileHash = "filehash-def"
	sub2v.MerkleRoot = "merkle-def"
	sub2, _ := s.SubmitForReview(sub2v)
	require.NoError(t, s.ReviewCSPS(sub2.ReviewID, true, "rv-1"))
	i2, err := s.ApproveAndIssue(chain.RoleRegulator, sub2.ReviewID, "issuer")
	require.NoError(t, err)

	assert.NotEqual(t, i1.CCCode, i2.CCCode, "两条内容应分配不同 MA 码")
}