package proposal_generation

import (
	"context"
	"errors"
	"testing"

	"gitea.maximumdirect.net/eric/audita/internal/core/config"
	"gitea.maximumdirect.net/eric/audita/internal/core/schema"
	"gitea.maximumdirect.net/eric/audita/internal/framework/contracts"
	"gitea.maximumdirect.net/eric/audita/internal/framework/proposals"
	"gitea.maximumdirect.net/eric/audita/internal/prompts"
)

func TestExecuteModuleProposalBuildsMessagesFromSectionAndDescription(t *testing.T) {
	client := &fakeStructuredClient{
		responses: []StructuredCorrectionSet{
			{Corrections: []StructuredCorrectionProposal{{TargetSegmentID: 1, OriginalText: "teh", CorrectedText: "the", Confidence: 0.9}}},
		},
	}
	section := contracts.SectionMetadata{Index: 7}
	cfg := config.Default()
	cfg.TranscriptDescription = "Hearing transcript with role titles."
	transcript := &schema.Transcript{Segments: []schema.Segment{{ID: 1, Speaker: "A", Start: 0, End: 1, Text: "teh"}}}
	glossary := &schema.Glossary{Entries: []schema.GlossaryEntry{{Name: "X"}}}

	var gotSectionIndex int
	var gotDescription string
	var gotTranscript *schema.Transcript
	var gotGlossary *schema.Glossary

	out, err := ExecuteModuleProposal(context.Background(), ModuleProposalRequest{
		ProposalRequest: contracts.ProposalRequest{
			ExecutionContext: contracts.ExecutionContext{
				Config:            &cfg,
				WorkingTranscript: transcript,
				Glossary:          glossary,
				Section:           &section,
			},
			RunSpec: contracts.ModuleRunSpec{
				ModuleKey:         "grammar",
				InstanceName:      "grammar",
				ReplacementPolicy: proposals.ReplacementPolicyRequireUnique,
			},
			LLMClient: client,
		},
		PromptID: prompts.PromptIDModuleGrammarProposal,
		BuildMessages: func(inTranscript *schema.Transcript, inGlossary *schema.Glossary, sectionIndex int, transcriptDescription string) ([]contracts.LLMMessage, error) {
			gotSectionIndex = sectionIndex
			gotDescription = transcriptDescription
			gotTranscript = inTranscript
			gotGlossary = inGlossary
			return []contracts.LLMMessage{{Role: "system", Content: "sys"}, {Role: "user", Content: "usr"}}, nil
		},
	})
	if err != nil {
		t.Fatalf("ExecuteModuleProposal error: %v", err)
	}
	if gotSectionIndex != 7 {
		t.Fatalf("section index: got=%d want=%d", gotSectionIndex, 7)
	}
	if gotDescription != cfg.TranscriptDescription {
		t.Fatalf("transcript description: got=%q want=%q", gotDescription, cfg.TranscriptDescription)
	}
	if gotTranscript != transcript {
		t.Fatalf("expected shared transcript pointer")
	}
	if gotGlossary != glossary {
		t.Fatalf("expected shared glossary pointer")
	}
	if len(client.calls) != 1 || client.calls[0].StageName != "grammar:proposal:section-0007" {
		t.Fatalf("unexpected stage name calls: %+v", client.calls)
	}
	if len(out.Proposals) != 1 || out.Proposals[0].CorrectedText != "the" {
		t.Fatalf("unexpected proposals: %+v", out)
	}
}

func TestExecuteModuleProposalValidatesInputs(t *testing.T) {
	if _, err := ExecuteModuleProposal(context.Background(), ModuleProposalRequest{}); err == nil {
		t.Fatalf("expected missing message builder error")
	}

	_, err := ExecuteModuleProposal(context.Background(), ModuleProposalRequest{
		BuildMessages: func(transcript *schema.Transcript, glossary *schema.Glossary, sectionIndex int, transcriptDescription string) ([]contracts.LLMMessage, error) {
			return nil, nil
		},
	})
	if err == nil {
		t.Fatalf("expected empty prompt ID error")
	}

	_, err = ExecuteModuleProposal(context.Background(), ModuleProposalRequest{
		PromptID: "missing.prompt.id",
		BuildMessages: func(transcript *schema.Transcript, glossary *schema.Glossary, sectionIndex int, transcriptDescription string) ([]contracts.LLMMessage, error) {
			return []contracts.LLMMessage{{Role: "system", Content: "sys"}, {Role: "user", Content: "usr"}}, nil
		},
	})
	if err == nil {
		t.Fatalf("expected unknown prompt ID error")
	}
}

func TestExecuteModuleProposalPropagatesBuilderError(t *testing.T) {
	wantErr := errors.New("builder failed")
	_, err := ExecuteModuleProposal(context.Background(), ModuleProposalRequest{
		PromptID: prompts.PromptIDModuleGlossaryProposal,
		BuildMessages: func(transcript *schema.Transcript, glossary *schema.Glossary, sectionIndex int, transcriptDescription string) ([]contracts.LLMMessage, error) {
			return nil, wantErr
		},
	})
	if !errors.Is(err, wantErr) {
		t.Fatalf("expected builder error, got %v", err)
	}
}