package codeview

import (
	"fmt"
	"io"
	"log/slog"
	"net/http"
	"strings"

	"github.com/kulak/gemini"
)

/*
 * Codeview is a feature that proxies my personal git server (forgejo)
 * Allowing me to render code natively in gemini
 *
 * Features:
 * - [x] Individual file view with line numbers?
 * - [ ] Dir view with links to files
 * - [ ] Project root view with markdown to gemtxt conversion and file tree
 */

// https://git.travisshears.com/travisshears/personal-gemini-capsule/raw/branch/main/internal/guestbook/guestbook.go
// /codeview/raw/personal-gemini-capsule/src/branch/main/internal/guestbook/guestbook.go
func HandleRequest(w gemini.ResponseWriter, req *gemini.Request) {
	path := req.URL.Path

	switch {
	// case path == "/gemlog" || path == "/gemlog/":
	// g.serveIndex(w, req)
	case strings.HasPrefix(path, "/codeview/raw/"):
		serveFile(w, req, path)
	default:
		w.WriteStatusMsg(gemini.StatusNotFound, "Page not found")
	}
}

func serveFile(w gemini.ResponseWriter, req *gemini.Request, path string) {
	path = strings.TrimPrefix(path, "/codeview/raw/")
	rawURL := strings.Replace(path, "src", "raw", 1)
	rawURL = "https://git.travisshears.com/travisshears/" + rawURL
	remoteURL := "https://git.travisshears.com/travisshears/" + path
	httpReq, err := http.NewRequest("GET", rawURL, nil)
	if err != nil {
		slog.Error("Failed to create request to git server", "error", err)
		w.WriteStatusMsg(gemini.StatusGeneralPermFail, "Problem connecting to git server")
		return
	}
	res, err := http.DefaultClient.Do(httpReq)
	if err != nil {
		slog.Error("Failed to send request to git server", "error", err)
		w.WriteStatusMsg(gemini.StatusGeneralPermFail, "Problem connecting to git server")
		return
	}
	defer res.Body.Close()

	body, err := io.ReadAll(res.Body)
	if err != nil {
		slog.Error("Failed to read res body", "error", err)
		w.WriteStatusMsg(gemini.StatusGeneralPermFail, "Problem connecting to git server")
		return
	}

	if res.StatusCode < 200 || res.StatusCode >= 300 {
		slog.Error("unexpected status code", "statusCode", res.StatusCode, "body", string(body))
		w.WriteStatusMsg(gemini.StatusGeneralPermFail, "Problem connecting to git server")
		return
	}

	var content strings.Builder
	w.WriteStatusMsg(gemini.StatusSuccess, "text/gemini")
	// filename := strings.TrimPrefix(remoteURL, "https://git.travisshears.com/travisshears/")
	// content.WriteString(fmt.Sprintf("# File: %s\n", filename))
	content.WriteString("# File CodeView\n")
	content.WriteString(fmt.Sprintf("This is a code view which proxies my personal git server. On the clearnet the following file is available at:\n=> %s %s\n\n", remoteURL, path))
	content.WriteString("----------------------------\n\n")
	content.WriteString("```code\n")
	content.Write(body)
	content.WriteString("```\n")
	content.WriteString("\n\n-----------------------------\n\n=> / Back to home\n")
	w.WriteBody([]byte(content.String()))
}