// runRepo + runScrum are Phase B entry points. Phase A leaves them
// as compilable stubs that produce the JSON shapes the gates expect
// but with zero analyzer findings — letting the pipeline structure
// be exercised end-to-end before analyzers land.
package cli

import (
	"context"
	"flag"
	"fmt"
	"os"
	"path/filepath"

	"local-review-harness/internal/config"
	"local-review-harness/internal/git"
	"local-review-harness/internal/pipeline"
)

func runRepo(ctx context.Context, repoPath string, cf commonFlags) int {
	if _, err := os.Stat(repoPath); err != nil {
		fmt.Fprintln(os.Stderr, "repo: target path:", err)
		return 65
	}
	rp, err := config.LoadReviewProfile(cf.reviewProfilePath)
	if err != nil {
		fmt.Fprintln(os.Stderr, "config:", err)
		return 65
	}
	mp, err := config.LoadModelProfile(cf.modelProfilePath)
	if err != nil {
		fmt.Fprintln(os.Stderr, "config:", err)
		return 65
	}

	outDir := resolveOutputDir(&cf, rp, repoPath)
	res, err := pipeline.RunRepo(ctx, pipeline.Inputs{
		RepoPath:      repoPath,
		ReviewProfile: rp,
		ModelProfile:  mp,
		OutputDir:     outDir,
		EmitScrum:     false,
		EnableLLM:     cf.enableLLM,
	})
	if err != nil {
		fmt.Fprintln(os.Stderr, "pipeline:", err)
		return 65
	}
	for _, f := range res.OutputFiles {
		fmt.Println(filepath.Join(outDir, f))
	}
	return res.ExitCode
}

// Diff is the `review-harness diff <path>` subcommand entry point
// (Phase E). Detects changed files via git (unstaged + staged + vs
// branch base), then runs the same pipeline as `repo` but scoped to
// just those files. PROMPT.md mode 2: "diff review."
func Diff(args []string) int {
	fs := flag.NewFlagSet("diff", flag.ContinueOnError)
	var cf commonFlags
	bindCommonFlags(fs, &cf)
	if err := fs.Parse(args); err != nil {
		return 64
	}
	if fs.NArg() < 1 {
		fmt.Fprintln(os.Stderr, "diff: missing target path")
		return 64
	}
	repoPath := fs.Arg(0)
	return runDiff(context.Background(), repoPath, cf)
}

func runDiff(ctx context.Context, repoPath string, cf commonFlags) int {
	if _, err := os.Stat(repoPath); err != nil {
		fmt.Fprintln(os.Stderr, "diff: target path:", err)
		return 65
	}
	rp, err := config.LoadReviewProfile(cf.reviewProfilePath)
	if err != nil {
		fmt.Fprintln(os.Stderr, "config:", err)
		return 65
	}
	mp, err := config.LoadModelProfile(cf.modelProfilePath)
	if err != nil {
		fmt.Fprintln(os.Stderr, "config:", err)
		return 65
	}

	changed, err := git.ChangedFiles(ctx, repoPath)
	if err != nil {
		fmt.Fprintln(os.Stderr, "diff: git probe:", err)
		return 65
	}
	if len(changed) == 0 {
		fmt.Fprintln(os.Stderr, "diff: no changed files (clean tree, no commits ahead of main/master) — exit 0")
		return 0
	}
	fmt.Fprintf(os.Stderr, "diff: scanning %d changed file(s):\n", len(changed))
	for _, f := range changed {
		fmt.Fprintln(os.Stderr, "  -", f)
	}

	outDir := resolveOutputDir(&cf, rp, repoPath)
	res, err := pipeline.RunRepo(ctx, pipeline.Inputs{
		RepoPath:      repoPath,
		ReviewProfile: rp,
		ModelProfile:  mp,
		OutputDir:     outDir,
		EmitScrum:     true, // diff mode emits the scrum bundle so PR reviewers see it
		EnableLLM:     cf.enableLLM,
		DiffOnlyFiles: changed,
	})
	if err != nil {
		fmt.Fprintln(os.Stderr, "pipeline:", err)
		return 65
	}
	for _, f := range res.OutputFiles {
		fmt.Println(filepath.Join(outDir, f))
	}
	return res.ExitCode
}

func runScrum(ctx context.Context, repoPath string, cf commonFlags) int {
	if _, err := os.Stat(repoPath); err != nil {
		fmt.Fprintln(os.Stderr, "scrum: target path:", err)
		return 65
	}
	rp, err := config.LoadReviewProfile(cf.reviewProfilePath)
	if err != nil {
		fmt.Fprintln(os.Stderr, "config:", err)
		return 65
	}
	mp, err := config.LoadModelProfile(cf.modelProfilePath)
	if err != nil {
		fmt.Fprintln(os.Stderr, "config:", err)
		return 65
	}

	outDir := resolveOutputDir(&cf, rp, repoPath)
	res, err := pipeline.RunRepo(ctx, pipeline.Inputs{
		RepoPath:      repoPath,
		ReviewProfile: rp,
		ModelProfile:  mp,
		OutputDir:     outDir,
		EmitScrum:     true,
		EnableLLM:     cf.enableLLM,
	})
	if err != nil {
		fmt.Fprintln(os.Stderr, "pipeline:", err)
		return 65
	}
	for _, f := range res.OutputFiles {
		fmt.Println(filepath.Join(outDir, f))
	}
	return res.ExitCode
}