// server.go - Simplified HTTP server
package http

import (
	"fmt"
	"strings"
	"time"

	"Moonshark/config"
	"Moonshark/metadata"
	"Moonshark/runner"
	"Moonshark/utils"

	"github.com/goccy/go-json"
	"github.com/valyala/bytebufferpool"
	"github.com/valyala/fasthttp"
)

func NewHttpServer(cfg *config.Config, handler fasthttp.RequestHandler, dbg bool) *fasthttp.Server {
	return &fasthttp.Server{
		Handler:               handler,
		Name:                  "Moonshark/" + metadata.Version,
		ReadTimeout:           30 * time.Second,
		WriteTimeout:          30 * time.Second,
		IdleTimeout:           120 * time.Second,
		MaxRequestBodySize:    16 << 20,
		TCPKeepalive:          true,
		ReduceMemoryUsage:     true,
		StreamRequestBody:     true,
		NoDefaultServerHeader: true,
	}
}

func NewPublicHandler(pubDir, prefix string) fasthttp.RequestHandler {
	if !strings.HasPrefix(prefix, "/") {
		prefix = "/" + prefix
	}
	if !strings.HasSuffix(prefix, "/") {
		prefix += "/"
	}

	fs := &fasthttp.FS{
		Root:                 pubDir,
		IndexNames:           []string{"index.html"},
		AcceptByteRange:      true,
		Compress:             true,
		CompressedFileSuffix: ".gz",
		CompressBrotli:       true,
		PathRewrite:          fasthttp.NewPathPrefixStripper(len(prefix) - 1),
	}
	return fs.NewRequestHandler()
}

func Send404(ctx *fasthttp.RequestCtx) {
	ctx.SetContentType("text/html; charset=utf-8")
	ctx.SetStatusCode(fasthttp.StatusNotFound)
	ctx.SetBody([]byte(utils.NotFoundPage(ctx.URI().String())))
}

func Send500(ctx *fasthttp.RequestCtx, err error) {
	ctx.SetContentType("text/html; charset=utf-8")
	ctx.SetStatusCode(fasthttp.StatusInternalServerError)

	if err == nil {
		ctx.SetBody([]byte(utils.InternalErrorPage(string(ctx.Path()), "")))
	} else {
		ctx.SetBody([]byte(utils.InternalErrorPage(string(ctx.Path()), err.Error())))
	}
}

// ApplyResponse applies a Response to a fasthttp.RequestCtx
func ApplyResponse(resp *runner.Response, ctx *fasthttp.RequestCtx) {
	// Set status code
	ctx.SetStatusCode(resp.Status)

	// Set headers
	for name, value := range resp.Headers {
		ctx.Response.Header.Set(name, value)
	}

	// Set cookies
	for _, cookie := range resp.Cookies {
		ctx.Response.Header.SetCookie(cookie)
	}

	// Process the body based on its type
	if resp.Body == nil {
		return
	}

	// Check if Content-Type was manually set
	contentTypeSet := false
	for name := range resp.Headers {
		if strings.ToLower(name) == "content-type" {
			contentTypeSet = true
			break
		}
	}

	// Get a buffer from the pool
	buf := bytebufferpool.Get()
	defer bytebufferpool.Put(buf)

	// Set body based on type
	switch body := resp.Body.(type) {
	case string:
		if !contentTypeSet {
			ctx.Response.Header.SetContentType("text/plain; charset=utf-8")
		}
		ctx.SetBodyString(body)
	case []byte:
		if !contentTypeSet {
			ctx.Response.Header.SetContentType("text/plain; charset=utf-8")
		}
		ctx.SetBody(body)
	case map[string]any, map[any]any, []any, []float64, []string, []int, []map[string]any:
		// Marshal JSON
		if err := json.NewEncoder(buf).Encode(body); err == nil {
			if !contentTypeSet {
				ctx.Response.Header.SetContentType("application/json")
			}
			ctx.SetBody(buf.Bytes())
		} else {
			// Fallback to string representation
			if !contentTypeSet {
				ctx.Response.Header.SetContentType("text/plain; charset=utf-8")
			}
			ctx.SetBodyString(fmt.Sprintf("%v", body))
		}
	default:
		// Check if it's any other map or slice type
		typeStr := fmt.Sprintf("%T", body)
		if typeStr[0] == '[' || (len(typeStr) > 3 && typeStr[:3] == "map") {
			if err := json.NewEncoder(buf).Encode(body); err == nil {
				if !contentTypeSet {
					ctx.Response.Header.SetContentType("application/json")
				}
				ctx.SetBody(buf.Bytes())
			} else {
				if !contentTypeSet {
					ctx.Response.Header.SetContentType("text/plain; charset=utf-8")
				}
				ctx.SetBodyString(fmt.Sprintf("%v", body))
			}
		} else {
			// Default to string representation
			if !contentTypeSet {
				ctx.Response.Header.SetContentType("text/plain; charset=utf-8")
			}
			ctx.SetBodyString(fmt.Sprintf("%v", body))
		}
	}
}

/*
func HandleDebugStats(ctx *fasthttp.RequestCtx) {
	stats := utils.CollectSystemStats(s.cfg)
	stats.Components = utils.ComponentStats{
		RouteCount:    0, // TODO: Get from router
		BytecodeBytes: 0, // TODO: Get from router
		SessionStats:  s.sessionManager.GetCacheStats(),
	}
	ctx.SetContentType("text/html; charset=utf-8")
	ctx.SetStatusCode(fasthttp.StatusOK)
	ctx.SetBody([]byte(utils.DebugStatsPage(stats)))
}
*/