package main

import (
	"database/sql"
	"embed"
	"flag"
	"fmt"
	"log"
	"os"
	"path/filepath"

	"github.com/wailsapp/wails/v2"
	"github.com/wailsapp/wails/v2/pkg/options"
	"github.com/wailsapp/wails/v2/pkg/options/assetserver"
)

//go:embed all:frontend/dist
var assets embed.FS

// examplesDir returns the path to the examples/ directory.
// Checks cwd first (wails dev), then next to the executable (production).
func examplesDir() string {
	// 1. examples/ in cwd (wails dev runs from project root)
	if info, err := os.Stat("examples"); err == nil && info.IsDir() {
		return "examples"
	}

	// 2. examples/ next to the executable (production binary)
	if exePath, err := os.Executable(); err == nil {
		dir := filepath.Join(filepath.Dir(exePath), "examples")
		if info, err := os.Stat(dir); err == nil && info.IsDir() {
			return dir
		}
	}

	return ""
}

func firstYAML(dir string) string {
	entries, err := os.ReadDir(dir)
	if err != nil {
		return ""
	}
	for _, e := range entries {
		if !e.IsDir() && (filepath.Ext(e.Name()) == ".yaml" || filepath.Ext(e.Name()) == ".yml") {
			return filepath.Join(dir, e.Name())
		}
	}
	return ""
}

func main() {
	// File logger for debugging
	logFile, err := os.OpenFile("rapid_dashboards.log", os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0644)
	if err == nil {
		log.SetOutput(logFile)
		defer logFile.Close()
	}

	log.Printf("=== rapid_dashboards starting ===")
	log.Printf("os.Args: %v", os.Args)
	log.Printf("DASHBOARD env: %q", os.Getenv("DASHBOARD"))
	log.Printf("cwd: %s", func() string { d, _ := os.Getwd(); return d }())

	dashboardPath := flag.String("dashboard", "", "path to dashboard YAML file")
	flag.Parse()

	log.Printf("flag --dashboard: %q", *dashboardPath)

	// Resolve examples directory — always used for listing/switching dashboards.
	dashDir := examplesDir()
	log.Printf("examples dir: %q", dashDir)

	// Fallback: CLI flag → env var → first YAML in examples/
	if *dashboardPath == "" {
		if envPath := os.Getenv("DASHBOARD"); envPath != "" {
			*dashboardPath = envPath
			log.Printf("using DASHBOARD env var: %q", envPath)
		} else if dashDir != "" {
			if first := firstYAML(dashDir); first != "" {
				*dashboardPath = first
				log.Printf("auto-discovered dashboard: %q", first)
			}
		}
	}

	var cfg *DashboardConfig
	var pool map[string]*sql.DB

	if *dashboardPath == "" {
		log.Printf("NO dashboard path — using dummy config (bindings mode)")
		cfg = &DashboardConfig{
			Settings:    Settings{Title: "rapid-dashboards", Width: 1280, Height: 800, Columns: 12},
			Queries:     map[string]QueryDef{},
			Filters:     map[string]FilterDef{},
			Sections:    []SectionDef{},
			Connections: map[string]ConnConfig{},
		}
	} else {
		log.Printf("loading dashboard from: %q", *dashboardPath)
		var loadErr error
		cfg, loadErr = LoadDashboard(*dashboardPath)
		if loadErr != nil {
			log.Printf("ERROR loading dashboard: %v", loadErr)
			fmt.Fprintf(os.Stderr, "error loading dashboard: %v\n", loadErr)
			os.Exit(1)
		}
		log.Printf("dashboard loaded OK — title=%q sections=%d queries=%d",
			cfg.Settings.Title, len(cfg.Sections), len(cfg.Queries))

		yamlDir := filepath.Dir(*dashboardPath)
		pool, loadErr = OpenConnections(cfg.Connections, yamlDir)
		if loadErr != nil {
			log.Printf("ERROR opening connections: %v", loadErr)
			fmt.Fprintf(os.Stderr, "error opening connections: %v\n", loadErr)
			os.Exit(1)
		}
		defer CloseConnections(pool)
		log.Printf("connections opened: %d", len(pool))
	}

	engine := NewQueryEngine(cfg, pool)
	app := NewApp(cfg, engine, pool, dashDir, *dashboardPath)

	log.Printf("starting wails — title=%q width=%d height=%d layout=%q dashDir=%q", cfg.Settings.Title, cfg.Settings.Width, cfg.Settings.Height, cfg.Settings.Layout, dashDir)

	wailsOpts := &options.App{
		Title:  cfg.Settings.Title,
		Width:  cfg.Settings.Width,
		Height: cfg.Settings.Height,
		AssetServer: &assetserver.Options{
			Assets: assets,
		},
		BackgroundColour: &options.RGBA{R: 10, G: 10, B: 15, A: 1},
		OnStartup:        app.startup,
		Bind: []interface{}{
			app,
		},
	}

	if cfg.Settings.Layout == "single_view" {
		wailsOpts.MaxWidth = cfg.Settings.Width
		wailsOpts.MaxHeight = cfg.Settings.Height
		wailsOpts.MinWidth = cfg.Settings.Width
		wailsOpts.MinHeight = cfg.Settings.Height
		wailsOpts.DisableResize = true
	}

	runErr := wails.Run(wailsOpts)

	if runErr != nil {
		log.Printf("ERROR wails.Run: %v", runErr)
		fmt.Fprintf(os.Stderr, "error: %v\n", runErr)
		os.Exit(1)
	}
	log.Printf("=== rapid_dashboards exited cleanly ===")
}