package publish

import (
	"context"
	"errors"
	"fmt"
	"os"
	"os/exec"
	"path/filepath"
	"sort"
	"strings"
)

type Attempt struct {
	RecordPath string
	Evidence   Evidence
}
type AttemptsResult struct {
	RecordDir   string
	Attempts    []Attempt
	Diagnostics []*RecoveryError
}

func ListAttempts(ctx context.Context, repositoryDir, override string) (AttemptsResult, error) {
	if repositoryDir == "" {
		repositoryDir = "."
	}
	result := AttemptsResult{Attempts: []Attempt{}, Diagnostics: []*RecoveryError{}}
	var directory string
	{
		resolved, err := recordDirectoryFor(ctx, repositoryDir, override)
		if err != nil {
			return result, &RecoveryError{Kind: "storage_enumeration", cause: err}
		}
		directory = resolved
	}
	result.RecordDir = directory
	if err := ctx.Err(); err != nil {
		return result, &RecoveryError{Kind: "canceled", cause: err}
	}
	entries, err := os.ReadDir(directory)
	if err != nil {
		return result, &RecoveryError{Kind: "storage_enumeration", cause: fmt.Errorf("enumerate records in %q: %w", directory, err)}
	}
	paths := make([]string, 0, len(entries))
	for _, entry := range entries {
		if !entry.IsDir() && strings.HasSuffix(entry.Name(), ".json") {
			paths = append(paths, filepath.Join(directory, entry.Name()))
		}
	}
	sort.Strings(paths)
	for _, path := range paths {
		if err := ctx.Err(); err != nil {
			return result, &RecoveryError{Kind: "canceled", cause: err}
		}
		absolute, err := filepath.Abs(path)
		if err != nil {
			result.Diagnostics = append(result.Diagnostics, &RecoveryError{Kind: "record_read", RecordPath: path, cause: err})
			continue
		}
		evidence, err := LoadEvidence(absolute)
		if err != nil {
			var recordError *RecoveryError
			if errors.As(err, &recordError) {
				result.Diagnostics = append(result.Diagnostics, recordError)
			}
			continue
		}
		result.Attempts = append(result.Attempts, Attempt{RecordPath: absolute, Evidence: evidence})
	}
	return result, nil
}

func recordDirectoryFor(ctx context.Context, repositoryDir, override string) (string, error) {
	if filepath.IsAbs(override) {
		return filepath.Clean(override), nil
	}
	root, err := exec.CommandContext(ctx, "git", "-C", repositoryDir, "rev-parse", "--show-toplevel").Output()
	if err != nil {
		return "", err
	}
	rootPath := strings.TrimSpace(string(root))
	if override != "" {
		return filepath.Join(rootPath, override), nil
	}
	common, err := exec.CommandContext(ctx, "git", "-C", repositoryDir, "rev-parse", "--path-format=absolute", "--git-common-dir").Output()
	if err != nil {
		return "", err
	}
	return filepath.Join(strings.TrimSpace(string(common)), "releasekit", "publication-attempts"), nil
}