package main

import (
	"context"
	"errors"
	"log/slog"
	"net/http"
	"os"
	"os/signal"
	"strings"
	"syscall"
	"time"

	"github.com/example/glpi-ai-agent/internal/agent"
	"github.com/example/glpi-ai-agent/internal/config"
	"github.com/example/glpi-ai-agent/internal/contextdata"
	"github.com/example/glpi-ai-agent/internal/glpi"
	"github.com/example/glpi-ai-agent/internal/knowledge"
	"github.com/example/glpi-ai-agent/internal/metrics"
	"github.com/example/glpi-ai-agent/internal/ollama"
	"github.com/example/glpi-ai-agent/internal/queue"
	"github.com/example/glpi-ai-agent/internal/state"
	"github.com/example/glpi-ai-agent/internal/uptimekuma"
	webui "github.com/example/glpi-ai-agent/internal/web"
)

func main() {
	cfg, err := config.Load()
	if err != nil {
		slog.Error("configuration invalid", "error", err)
		os.Exit(1)
	}
	level := slog.LevelInfo
	switch strings.ToLower(cfg.LogLevel) {
	case "debug":
		level = slog.LevelDebug
	case "warn":
		level = slog.LevelWarn
	case "error":
		level = slog.LevelError
	}
	slog.SetDefault(slog.New(slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{Level: level})))
	ctx, cancel := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
	defer cancel()
	g := glpi.New(cfg.GLPIURL, cfg.GLPIAPIVersion, cfg.GLPIClientID, cfg.GLPIClientSecret, cfg.GLPIUsername, cfg.GLPIPassword, cfg.GLPITimeout)
	o := ollama.New(cfg.OllamaURL, cfg.OllamaModel, cfg.OllamaEmbeddingModel, cfg.CommunicationLanguage, cfg.CommunicationStyle, cfg.OllamaTimeout, cfg.OllamaNumPredict, cfg.OllamaKeepAlive, cfg.OllamaThink, cfg.OllamaMaxConcurrent)
	if err := g.ValidateContract(ctx); err != nil {
		slog.Error("GLPI API contract validation failed", "error", err)
		os.Exit(1)
	}
	if cfg.ContextEnabled {
		var optionalRoutes []string
		if cfg.ChangeCalendarEnabled {
			optionalRoutes = append(optionalRoutes, cfg.GLPIChangePath)
		}
		if cfg.UserDeviceContextEnabled {
			optionalRoutes = append(optionalRoutes, cfg.GLPIUserDevicePaths...)
		}
		if err := g.ValidateReadRoutes(ctx, optionalRoutes); err != nil {
			slog.Error("GLPI context API contract validation failed", "error", err)
			os.Exit(1)
		}
	}
	st, err := state.Open(cfg.DataDir, 2000)
	if err != nil {
		slog.Error("state store initialization failed", "error", err)
		os.Exit(1)
	}
	k, err := knowledge.Load(ctx, cfg.KnowledgeDir, cfg.DataDir, o, cfg.RAGEnabled, cfg.KnowledgeAllowedSources)
	if err != nil {
		slog.Error("knowledge store initialization failed",
			"error", err,
			"knowledge_dir", cfg.KnowledgeDir,
			"data_dir", cfg.DataDir,
			"rag_enabled", cfg.RAGEnabled,
		)
		os.Exit(1)
	}
	m := metrics.New()
	m.SetKnowledgeDocs(k.Count())
	q := queue.New(cfg.QueueSize)
	var kuma *uptimekuma.Client
	if cfg.UptimeKumaEnabled {
		kuma = uptimekuma.New(cfg.UptimeKumaURL, cfg.UptimeKumaMode, cfg.UptimeKumaAPIKey, cfg.UptimeKumaTimeout)
	}
	contextCollector := contextdata.New(cfg, g, kuma)
	svc := agent.New(cfg, g, o, k, st, q, m, contextCollector)
	svc.Start(ctx)
	web, err := webui.New(cfg, m, st, q)
	if err != nil {
		slog.Error("web UI initialization failed", "error", err)
		os.Exit(1)
	}
	srv := webui.Listen(cfg.HTTPAddr, web.Handler())
	go func() {
		slog.Info("web server started", "addr", cfg.HTTPAddr, "dry_run", cfg.DryRun, "auto_reply", cfg.AutoReply)
		if err := srv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
			slog.Error("web server failed", "error", err)
			cancel()
		}
	}()
	<-ctx.Done()
	shutdownCtx, c := context.WithTimeout(context.Background(), 10*time.Second)
	defer c()
	_ = srv.Shutdown(shutdownCtx)
	slog.Info("shutdown complete")
}