package http

import (
	"encoding/json"
	"fmt"
	"log/slog"
	"net/http"

	"git.yigid.dev/fyb/tingz/internal/deploy"
	"git.yigid.dev/fyb/tingz/internal/user"
)

type Server struct {
	userMgr   *user.Manager
	deployMgr *deploy.Manager
	logger    *slog.Logger
	baseURL   string
}

func NewServer(userMgr *user.Manager, deployMgr *deploy.Manager, logger *slog.Logger, baseURL string) *Server {
	return &Server{
		userMgr:   userMgr,
		deployMgr: deployMgr,
		logger:    logger,
		baseURL:   baseURL,
	}
}

func (s *Server) handleAuthCreate(w http.ResponseWriter, r *http.Request) {
	var req struct {
		Username string `json:"username"`
	}

	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		s.logger.Warn("failed to decode request", slog.String("error", err.Error()))
		writeJSON(w, http.StatusBadRequest, map[string]string{
			"status": "error",
			"error":  "invalid request body",
		})
		return
	}

	if !user.ValidateUsername(req.Username) {
		s.logger.Warn("invalid username", slog.String("username", req.Username))
		writeJSON(w, http.StatusBadRequest, map[string]string{
			"status": "error",
			"error":  "invalid username format",
		})
		return
	}

	token, err := s.userMgr.CreateOrUpdate(r.Context(), req.Username)
	if err != nil {
		s.logger.Error("failed to create/update user",
			slog.String("username", req.Username),
			slog.String("error", err.Error()))
		writeJSON(w, http.StatusInternalServerError, map[string]string{
			"status": "error",
			"error":  "failed to create user",
		})
		return
	}

	s.logger.Info("user created/updated", slog.String("username", req.Username))
	writeJSON(w, http.StatusOK, map[string]string{
		"status": "ok",
		"token":  token,
	})
}

func (s *Server) handleAuthDelete(w http.ResponseWriter, r *http.Request) {
	var req struct {
		Username string `json:"username"`
		Files    string `json:"files"`
	}

	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		s.logger.Warn("failed to decode request", slog.String("error", err.Error()))
		writeJSON(w, http.StatusBadRequest, map[string]string{
			"status": "error",
			"error":  "invalid request body",
		})
		return
	}

	if !user.ValidateUsername(req.Username) {
		s.logger.Warn("invalid username", slog.String("username", req.Username))
		writeJSON(w, http.StatusBadRequest, map[string]string{
			"status": "error",
			"error":  "invalid username format",
		})
		return
	}

	if req.Files == "" {
		req.Files = "persist"
	}

	deleteFiles := false
	if req.Files == "delete" {
		deleteFiles = true
	} else if req.Files != "persist" {
		writeJSON(w, http.StatusBadRequest, map[string]string{
			"status": "error",
			"error":  "files must be 'persist' or 'delete'",
		})
		return
	}

	err := s.userMgr.Delete(r.Context(), req.Username, deleteFiles)
	if err != nil {
		s.logger.Error("failed to delete user",
			slog.String("username", req.Username),
			slog.String("error", err.Error()))
		writeJSON(w, http.StatusInternalServerError, map[string]string{
			"status": "error",
			"error":  err.Error(),
		})
		return
	}

	s.logger.Info("user deleted",
		slog.String("username", req.Username),
		slog.Bool("files_deleted", deleteFiles))
	writeJSON(w, http.StatusOK, map[string]string{
		"status": "ok",
	})
}

func (s *Server) handleDeploy(w http.ResponseWriter, r *http.Request) {
	username, ok := getUsernameFromContext(r.Context())
	if !ok {
		writeJSON(w, http.StatusUnauthorized, map[string]string{
			"status": "error",
			"error":  "unauthorized",
		})
		return
	}

	if err := r.ParseMultipartForm(32 << 20); err != nil {
		s.logger.Warn("failed to parse multipart form", slog.String("error", err.Error()))
		writeJSON(w, http.StatusBadRequest, map[string]string{
			"status": "error",
			"error":  "failed to parse multipart form",
		})
		return
	}

	project := r.FormValue("project")
	if !user.ValidateProjectName(project) {
		s.logger.Warn("invalid project name", slog.String("project", project))
		writeJSON(w, http.StatusBadRequest, map[string]string{
			"status": "error",
			"error":  "invalid project name format",
		})
		return
	}

	file, header, err := r.FormFile("file")
	if err != nil {
		s.logger.Warn("failed to get file from form", slog.String("error", err.Error()))
		writeJSON(w, http.StatusBadRequest, map[string]string{
			"status": "error",
			"error":  "missing or invalid file",
		})
		return
	}
	defer file.Close()

	s.logger.Info("processing deployment",
		slog.String("username", username),
		slog.String("project", project),
		slog.String("filename", header.Filename),
		slog.Int64("size", header.Size))

	releaseID, err := s.deployMgr.Deploy(r.Context(), username, project, file)
	if err != nil {
		s.logger.Error("deployment failed",
			slog.String("username", username),
			slog.String("project", project),
			slog.String("error", err.Error()))
		writeJSON(w, http.StatusInternalServerError, map[string]string{
			"status": "error",
			"error":  err.Error(),
		})
		return
	}

	url := fmt.Sprintf("%s/%s/%s/", s.baseURL, username, project)
	writeJSON(w, http.StatusOK, map[string]string{
		"status":   "ok",
		"project":  project,
		"username": username,
		"url":      url,
		"release":  releaseID,
	})
}

func (s *Server) handleStatus(w http.ResponseWriter, r *http.Request) {
	writeJSON(w, http.StatusOK, map[string]string{
		"status": "ok",
	})
}

func (s *Server) handleHello(w http.ResponseWriter, r *http.Request) {
	writeJSON(w, http.StatusOK, map[string]string{
		"message":        "Close the world, .txen eht nepO",
		"author":         "Yigid BALABAN <hey@yigid.dev>",
		"authorHomepage": "https://yigid.dev/",
	})
}

func writeJSON(w http.ResponseWriter, status int, data interface{}) {
	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(status)
	json.NewEncoder(w).Encode(data)
}