package handlers

import (
	"errors"
	"strconv"
	"strings"

	"polar/internal/user"
	"polar/internal/web/middleware"

	"github.com/gofiber/fiber/v2"
)

func (h *Handler) AdminApproveUserSubmit(c *fiber.Ctx) error {
	id, err := strconv.ParseInt(c.Params("id"), 10, 64)
	if err != nil {
		return c.Redirect("/admin", fiber.StatusSeeOther)
	}
	target, err := h.userSvc.GetByID(c.UserContext(), id)
	if err != nil {
		h.setFlashT(c, "flash.admin_user_missing")
		return c.Redirect("/admin", fiber.StatusSeeOther)
	}
	if err := h.userSvc.SetApproved(c.UserContext(), target.ID, true); err != nil {
		h.logger.Error("approve account failed", "user_id", target.ID, "err", err)
		h.setFlashT(c, "flash.admin_user_update_failed")
		return c.Redirect("/admin", fiber.StatusSeeOther)
	}
	h.setFlashT(c, "flash.admin_user_approved", target.Username)
	return c.Redirect("/admin", fiber.StatusSeeOther)
}

func (h *Handler) AdminToggleUserAdminSubmit(c *fiber.Ctx) error {
	id, err := strconv.ParseInt(c.Params("id"), 10, 64)
	if err != nil {
		return c.Redirect("/admin", fiber.StatusSeeOther)
	}
	current := middleware.CurrentUser(c)
	target, err := h.userSvc.GetByID(c.UserContext(), id)
	if err != nil {
		h.setFlashT(c, "flash.admin_user_missing")
		return c.Redirect("/admin", fiber.StatusSeeOther)
	}
	if current != nil && target.ID == current.ID {
		h.setFlashT(c, "flash.admin_self_role")
		return c.Redirect("/admin", fiber.StatusSeeOther)
	}
	if err := h.userSvc.SetAdmin(c.UserContext(), target.ID, !target.IsAdmin); err != nil {
		if errors.Is(err, user.ErrLastAdmin) {
			h.setFlashT(c, "flash.admin_last_admin")
		} else {
			h.logger.Error("update administrator role failed", "user_id", target.ID, "err", err)
			h.setFlashT(c, "flash.admin_user_update_failed")
		}
		return c.Redirect("/admin", fiber.StatusSeeOther)
	}
	h.setFlashT(c, "flash.admin_role_updated", target.Username)
	return c.Redirect("/admin", fiber.StatusSeeOther)
}

func (h *Handler) AdminDeleteUserSubmit(c *fiber.Ctx) error {
	id, err := strconv.ParseInt(c.Params("id"), 10, 64)
	if err != nil {
		return c.Redirect("/admin", fiber.StatusSeeOther)
	}
	current := middleware.CurrentUser(c)
	target, err := h.userSvc.GetByID(c.UserContext(), id)
	if err != nil {
		h.setFlashT(c, "flash.admin_user_missing")
		return c.Redirect("/admin", fiber.StatusSeeOther)
	}
	if current != nil && target.ID == current.ID {
		h.setFlashT(c, "flash.admin_delete_self")
		return c.Redirect("/admin", fiber.StatusSeeOther)
	}
	if !strings.EqualFold(strings.TrimSpace(c.FormValue("confirm_username")), target.Username) {
		h.setFlashT(c, "flash.admin_delete_mismatch")
		return c.Redirect("/admin", fiber.StatusSeeOther)
	}

	if err := h.deleteAccount(c.UserContext(), target); err != nil {
		h.logger.Error("admin delete account failed", "user_id", target.ID, "err", err)
		if errors.Is(err, user.ErrLastAdmin) {
			h.setFlashT(c, "flash.admin_last_admin")
		} else {
			h.setFlashT(c, "flash.admin_user_delete_failed")
		}
		return c.Redirect("/admin", fiber.StatusSeeOther)
	}
	h.setFlashT(c, "flash.admin_user_deleted", target.Username)
	return c.Redirect("/admin", fiber.StatusSeeOther)
}

func (h *Handler) AdminDeleteRepoSubmit(c *fiber.Ctx) error {
	id, err := strconv.ParseInt(c.Params("id"), 10, 64)
	if err != nil {
		return c.Redirect("/admin", fiber.StatusSeeOther)
	}
	r, err := h.repoSvc.GetByID(c.UserContext(), id)
	if err != nil {
		h.setFlashT(c, "flash.admin_repo_missing")
		return c.Redirect("/admin", fiber.StatusSeeOther)
	}
	if !strings.EqualFold(strings.TrimSpace(c.FormValue("confirm_name")), r.Name) {
		h.setFlashT(c, "flash.admin_delete_mismatch")
		return c.Redirect("/admin", fiber.StatusSeeOther)
	}
	if err := h.repoSvc.Delete(c.UserContext(), r); err != nil {
		h.logger.Error("admin delete repository failed", "repo_id", r.ID, "err", err)
		h.setFlashT(c, "flash.admin_repo_delete_failed")
		return c.Redirect("/admin", fiber.StatusSeeOther)
	}
	h.setFlashT(c, "flash.admin_repo_deleted", r.OwnerUsername, r.Name)
	return c.Redirect("/admin", fiber.StatusSeeOther)
}