package main

import (
	"context"
	"fmt"
	"log"
	"os"
	"os/signal"
	"sync"
	"syscall"
	"time"
)

// Version information
var (
	Version   = "v3.1.0"
	BuildTime = "unknown"
	GitCommit = "unknown"
)

func main() {
	// Print version information
	log.Printf("[MAIN] Jenkins-Cron %s (built: %s, commit: %s)", Version, BuildTime, GitCommit)

	// Get configuration path
	configPath := GetConfigPath()
	log.Printf("[MAIN] Loading configuration from: %s", configPath)

	// Load configuration with proper error handling
	cfg, err := LoadConfig(configPath)
	if err != nil {
		log.Fatalf("[MAIN] Failed to load configuration: %v", err)
	}

	// Validate configuration
	if len(cfg.Jobs) == 0 {
		log.Fatalf("[MAIN] No jobs configured")
	}
	if cfg.Jenkins.URL == "" {
		log.Fatalf("[MAIN] No Jenkins URL configured")
	}

	// Create a cancelable context
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	// Setup signal handling for graceful shutdown
	setupSignalHandler(cancel)

	// Clean Gradle caches
	if err := cleanGradleCaches(ctx, cfg); err != nil {
		log.Printf("[MAIN] Warning: Error cleaning Gradle caches: %v", err)
	}

	// Create Jenkins client
	var jenkinsSvc JenkinsService = NewJenkinsClient(&cfg.Jenkins)

	// Trigger Jenkins jobs
	if err := triggerJobs(ctx, jenkinsSvc, cfg); err != nil {
		log.Printf("[MAIN] Error triggering jobs: %v", err)
		os.Exit(1)
	}

	log.Printf("[MAIN] All operations completed successfully")
}

// setupSignalHandler sets up handling of OS signals for graceful shutdown
func setupSignalHandler(cancel context.CancelFunc) {
	c := make(chan os.Signal, 1)
	signal.Notify(c, os.Interrupt, syscall.SIGTERM)

	go func() {
		sig := <-c
		log.Printf("[MAIN] Received signal %v, shutting down gracefully", sig)
		cancel()

		// Force exit after 5 seconds if graceful shutdown is taking too long
		time.Sleep(5 * time.Second)
		log.Printf("[MAIN] Forced shutdown after timeout")
		os.Exit(1)
	}()
}

// cleanGradleCaches cleans Gradle caches in parallel
func cleanGradleCaches(ctx context.Context, cfg *Config) error {
	if len(cfg.Gradle.Caches) == 0 {
		log.Printf("[MAIN] No Gradle caches configured, skipping cleanup")
		return nil
	}

	log.Printf("[MAIN] Starting Gradle cache cleanup")
	stats := &RemoveStats{}

	var wg sync.WaitGroup
	var errs []error
	var mu sync.Mutex

	for _, cache := range cfg.Gradle.Caches {
		wg.Add(1)
		go func(cachePath string) {
			defer wg.Done()

			log.Printf("[MAIN] Cleaning cache: %s", cachePath)
			err := Remove(ctx, cachePath, RemoveOptions{
				Workers: 4,
				Retries: 3,
				Stats:   stats,
				Logger:  log.Printf,
				Progress: func(current int64) {
					if current > 0 && current%100 == 0 {
						log.Printf("[MAIN] Removed %d files from %s", current, cachePath)
					}
				},
			})

			if err != nil {
				log.Printf("[MAIN] Error removing cache %s: %v", cachePath, err)
				mu.Lock()
				errs = append(errs, fmt.Errorf("cache %s: %w", cachePath, err))
				mu.Unlock()
			}
		}(cache)
	}

	wg.Wait()
	log.Printf("[MAIN] Cache cleanup summary: Total=%d Success=%d Failed=%d",
		stats.Total, stats.Success, stats.Failed)

	if len(errs) > 0 {
		return fmt.Errorf("encountered %d errors during cache cleanup", len(errs))
	}
	return nil
}

// triggerJobs triggers all configured Jenkins jobs
func triggerJobs(ctx context.Context, js JenkinsService, cfg *Config) error {
	log.Printf("[MAIN] Starting to trigger %d Jenkins jobs", len(cfg.Jobs))

	var wg sync.WaitGroup
	errChan := make(chan error, len(cfg.Jobs))

	// Create a timeout context for the entire operation
	ctx, cancel := context.WithTimeout(ctx, 5*time.Minute)
	defer cancel()

	for _, job := range cfg.Jobs {
		wg.Add(1)
		go func(jobName string) {
			defer wg.Done()

			if err := processJob(ctx, js, cfg, jobName); err != nil {
				log.Printf("[MAIN] Error processing job %s: %v", jobName, err)
				errChan <- fmt.Errorf("job %s: %w", jobName, err)
			}
		}(job)
	}

	// Wait for all jobs to complete
	wg.Wait()
	close(errChan)

	// Collect errors
	var errs []error
	for err := range errChan {
		errs = append(errs, err)
	}

	if len(errs) > 0 {
		return fmt.Errorf("encountered %d errors while triggering jobs", len(errs))
	}
	return nil
}

// processJob handles the processing of a single Jenkins job
func processJob(ctx context.Context, js JenkinsService, cfg *Config, job string) error {
	log.Printf("[MAIN] Processing job: %s", job)

	// Fetch build with retry
	build, err := js.FetchBuildWithRetry(ctx, job, cfg.Retries)
	if err != nil {
		return fmt.Errorf("failed to fetch build: %w", err)
	}

	log.Printf("[MAIN] Successfully fetched build #%d for job: %s", build.Number, job)

	// Extract and merge parameters
	latestParams := ExtractBuildParams(build)

	skipLatestBuild := false
	for _, skip := range cfg.Jenkins.SkipParameters {
		if IsSubset(latestParams, skip) {
			log.Printf("[MAIN] Skipping build (subset of latest) for job %s: %+v", job, skip)
			skipLatestBuild = true
			break
		}
	}

	if !skipLatestBuild {
		merged := MergeParams(latestParams, cfg.Jenkins.DefaultParameters)
		// Trigger build with default parameters
		log.Printf("[MAIN] Triggering build with default parameters for job: %s", job)
		if err := js.TriggerBuildWithRetry(ctx, build, StringMapToInterfaceMap(merged), cfg.Retries); err != nil {
			log.Printf("[MAIN] Failed to trigger build with default parameters for job %s: %v", job, err)
			// Continue with special parameters even if default build fails
		}
	}

	// Process special parameters
	for _, special := range cfg.Jenkins.SpecialParameters {
		if IsSubset(latestParams, special) {
			log.Printf("[MAIN] Skipping special parameters build (subset of latest) for %s: %+v", job, special)
			continue
		}

		log.Printf("[MAIN] Triggering build with special parameters for job %s: %+v", job, special)
		specialLatestParams := make(map[string]string)
		for k, v := range latestParams {
			specialLatestParams[k] = v
		}
		for k, v := range special {
			specialLatestParams[k] = fmt.Sprintf("%v", v)
		}

		specialMerged := MergeParams(specialLatestParams, cfg.Jenkins.DefaultParameters)
		if err := js.TriggerBuildWithRetry(ctx, build, StringMapToInterfaceMap(specialMerged), cfg.Retries); err != nil {
			log.Printf("[MAIN] Failed to trigger build with special parameters for job %s: %v", job, err)
			// Continue with other special parameters even if one fails
		}
	}

	return nil
}