//go:build mage

package main

import (
	"io/fs"
	"os"
	"path/filepath"
	"strconv"
	"strings"

	"golang.org/x/exp/slices"
	"golang.org/x/exp/slog"
)

var (
	WorkingDir         string
	GoSourceFiles      []string
	GeneratedMockFiles []string
	IsReleaseBuild     bool
	IsPRBuild          bool

	repoOwner       = "prskr"
	repoName        = "nitter"
	prIndex   int64 = 1

	dirsToIgnore = []string{
		".git",
		"build",
		".run",
		".task",
	}
)

func init() {
	slog.SetDefault(slog.New(slog.NewTextHandler(os.Stderr)))

	IsReleaseBuild = strings.EqualFold(os.Getenv("DRONE_BUILD_EVENT"), "tag")
	IsPRBuild = strings.EqualFold(os.Getenv("DRONE_BUILD_EVENT"), "pull_request")

	if wd, err := os.Getwd(); err != nil {
		slog.Error("Failed to get working directory", err)
		os.Exit(1)
	} else {
		WorkingDir = wd
	}

	if owner := os.Getenv("DRONE_REPO_NAMESPACE"); owner != "" {
		repoOwner = owner
	}

	if name := os.Getenv("DRONE_REPO_NAME"); name != "" {
		repoName = name
	}

	if prIdxRaw := os.Getenv("DRONE_PULL_REQUEST"); prIdxRaw != "" {
		if parsed, err := strconv.ParseInt(prIdxRaw, 10, 64); err != nil {
			slog.Error("Failed to parse PR index", err)
			os.Exit(1)
		} else {
			prIndex = parsed
		}
	}
	if err := initSourceFiles(); err != nil {
		slog.Error("Failed to init source files", err)
		os.Exit(1)
	}

	slog.Info("Completed initialization")
}

func initSourceFiles() error {
	return filepath.WalkDir(WorkingDir, func(path string, d fs.DirEntry, err error) error {
		if err != nil {
			return err
		}

		if d.IsDir() {
			if slices.Contains(dirsToIgnore, filepath.Base(path)) {
				return fs.SkipDir
			}
			return nil
		}

		_, ext, found := strings.Cut(filepath.Base(path), ".")
		if !found {
			return nil
		}

		switch ext {
		case "mock.go":
			GeneratedMockFiles = append(GeneratedMockFiles, path)
		case "go":
			GoSourceFiles = append(GoSourceFiles, path)
		}

		return nil
	})
}