package logging

import (
	"context"
	"log/slog"
	"os"
	"path/filepath"
	"strings"
	"testing"

	"go.uber.org/zap"
	"go.uber.org/zap/zapcore"
)

func TestZapHandlerHonorsConfiguredLevel(t *testing.T) {
	root := t.TempDir()
	handler, cleanup := newZapHandler(root, "application.log", Options{Level: "error", Format: "json"}, nil)
	defer cleanup()

	if handler.Enabled(context.Background(), slog.LevelInfo) {
		t.Fatal("info should be disabled when level is error")
	}
	if !handler.Enabled(context.Background(), slog.LevelError) {
		t.Fatal("error should be enabled when level is error")
	}
}

func TestZapHandlerUsesDebugFallbackForInvalidLevel(t *testing.T) {
	root := t.TempDir()
	handler, cleanup := newZapHandler(root, "application.log", Options{Level: "not-a-level", Format: "json"}, nil)
	defer cleanup()

	if !handler.Enabled(context.Background(), slog.LevelDebug) {
		t.Fatal("invalid levels should use the reference debug fallback")
	}
}

func TestZapHandlerRoutesHTTPAndErrorLogs(t *testing.T) {
	root := t.TempDir()
	handler, cleanup := newZapHandler(root, "application.log", Options{Level: "info", Format: "json"}, nil)
	logger := slog.New(handler)
	logger.Info("request", "mod", "http", "request_id", "req-1")
	logger.Error("failed", "mod", "users")
	cleanup()

	dateEntries, err := os.ReadDir(root)
	if err != nil || len(dateEntries) != 1 {
		t.Fatalf("expected one daily log directory, entries=%v err=%v", len(dateEntries), err)
	}
	date := dateEntries[0].Name()
	paths := []string{
		filepath.Join(root, date, "application.log"),
		filepath.Join(root, date, "http", "access.log"),
		filepath.Join(root, date, "users", "application.log"),
		filepath.Join(root, date, "error", "error.log"),
	}
	for _, path := range paths {
		if info, err := os.Stat(path); err != nil || info.Size() == 0 {
			t.Fatalf("expected non-empty routed log %s: info=%v err=%v", path, info, err)
		}
	}
}

func TestZapHandlerRecordsEveryErrorThroughSink(t *testing.T) {
	root := t.TempDir()
	var entries []ErrorEntry
	logger, control := NewReloadableZapLogger(root, "application.log", Options{Level: "info", Format: "json"})
	defer control.Close()
	control.SetErrorSink(ErrorSinkFunc(func(_ context.Context, entry ErrorEntry) error {
		entries = append(entries, entry)
		return nil
	}))
	logger.Error("task execution failed", "mod", "timedTask", "request_id", "request-1", "trace_id", "trace-1", "error", os.ErrPermission)
	control.Reload(t.TempDir(), Options{Level: "info", Format: "json"})
	logger.Error("reloaded logger failure", "mod", "system")

	if len(entries) != 2 {
		t.Fatalf("expected two error entries across reload, got %d", len(entries))
	}
	entry := entries[0]
	if entry.Form != "后端" || entry.Level != "error" || entry.RequestID != "request-1" || entry.TraceID != "trace-1" || !strings.Contains(entry.Info, "task execution failed") || !strings.Contains(entry.Info, os.ErrPermission.Error()) {
		t.Fatalf("unexpected error entry: %+v", entry)
	}
}

func TestErrorEntryIncludesFinalApplicationSource(t *testing.T) {
	filename := filepath.Join(t.TempDir(), "worker.go")
	content := "package sample\n\nfunc execute() {\n\tprintln(\"failed\")\n}\n"
	if err := os.WriteFile(filename, []byte(content), 0o600); err != nil {
		t.Fatal(err)
	}
	entry := errorEntryFromZap(zapcore.Entry{Message: "task failed", Level: zapcore.ErrorLevel, Stack: "kra/internal/worker.execute\n" + filename + ":4"}, nil)
	if !strings.Contains(entry.Info, "最终调用方法:"+filename+":4 (execute lines 3-5)") || !strings.Contains(entry.Info, "func execute()") {
		t.Fatalf("expected final caller source in error entry: %s", entry.Info)
	}
}

func TestErrorSinkSkipsGORMBridge(t *testing.T) {
	root := t.TempDir()
	var entries []ErrorEntry
	state := &errorSinkState{sink: ErrorSinkFunc(func(_ context.Context, entry ErrorEntry) error {
		entries = append(entries, entry)
		return nil
	})}
	base := zapcore.NewNopCore()
	core := &routedFileCore{base: base, encoder: zapcore.NewJSONEncoder(zap.NewProductionEncoderConfig()), level: zapcore.ErrorLevel, root: root, state: &routedFileState{writers: map[string]*DailyWriter{}}, errorSink: state}
	for _, filename := range []string{"/tmp/gorm_logger_writer.go", "/workspace/internal/data/gorm_logger.go"} {
		if err := core.Write(zapcore.Entry{Level: zapcore.ErrorLevel, Message: "database failed", Caller: zapcore.EntryCaller{Defined: true, File: filename, Line: 10}}, nil); err != nil {
			t.Fatal(err)
		}
	}
	if err := core.Write(zapcore.Entry{Level: zapcore.ErrorLevel, Message: "database failed"}, []zapcore.Field{zap.Bool("gorm_logger", true)}); err != nil {
		t.Fatal(err)
	}
	if len(entries) != 0 {
		t.Fatalf("gorm bridge error must not recurse into sys_error: %+v", entries)
	}
}