package handlers

import (
	"encoding/json"
	"net/http"
	"strconv"

	"prompt-generator/internal/db"
	"prompt-generator/internal/models"
)

func GetSnippets(w http.ResponseWriter, r *http.Request) {
	category := r.URL.Query().Get("category")

	query := "SELECT id, name, content, category, scope, created_at FROM snippets"
	var args []interface{}
	if category != "" {
		query += " WHERE category=?"
		args = append(args, category)
	}
	query += " ORDER BY scope, category, id"

	rows, err := db.DB.Query(query, args...)
	if err != nil {
		fail(w, 500, "查询片段失败")
		return
	}
	defer rows.Close()

	var snippets []models.Snippet
	for rows.Next() {
		var s models.Snippet
		if err := rows.Scan(&s.ID, &s.Name, &s.Content, &s.Category, &s.Scope, &s.CreatedAt); err != nil {
			continue
		}
		snippets = append(snippets, s)
	}
	if snippets == nil {
		snippets = []models.Snippet{}
	}
	success(w, snippets)
}

func CreateSnippet(w http.ResponseWriter, r *http.Request) {
	var req struct {
		Name     string `json:"name"`
		Content  string `json:"content"`
		Category string `json:"category"`
	}
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil || req.Name == "" {
		fail(w, 400, "片段名称不能为空")
		return
	}

	res, err := db.DB.Exec("INSERT INTO snippets (name, content, category, scope) VALUES (?, ?, ?, 'personal')",
		req.Name, req.Content, req.Category)
	if err != nil {
		fail(w, 500, "创建片段失败")
		return
	}

	id, _ := res.LastInsertId()
	success(w, map[string]int64{"id": id})
}

func UpdateSnippet(w http.ResponseWriter, r *http.Request) {
	id, err := strconv.ParseInt(r.PathValue("id"), 10, 64)
	if err != nil {
		fail(w, 400, "无效的 ID")
		return
	}

	var scope string
	db.DB.QueryRow("SELECT scope FROM snippets WHERE id=?", id).Scan(&scope)
	if scope != "personal" {
		fail(w, 403, "不能修改系统片段")
		return
	}

	var req struct {
		Name     string `json:"name"`
		Content  string `json:"content"`
		Category string `json:"category"`
	}
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		fail(w, 400, "请求格式错误")
		return
	}

	_, err = db.DB.Exec("UPDATE snippets SET name=?, content=?, category=? WHERE id=?",
		req.Name, req.Content, req.Category, id)
	if err != nil {
		fail(w, 500, "更新片段失败")
		return
	}
	success(w, nil)
}

func DeleteSnippet(w http.ResponseWriter, r *http.Request) {
	id, err := strconv.ParseInt(r.PathValue("id"), 10, 64)
	if err != nil {
		fail(w, 400, "无效的 ID")
		return
	}

	var scope string
	db.DB.QueryRow("SELECT scope FROM snippets WHERE id=?", id).Scan(&scope)
	if scope != "personal" {
		fail(w, 403, "不能删除系统片段")
		return
	}

	db.DB.Exec("DELETE FROM snippets WHERE id=?", id)
	success(w, nil)
}