const logger = require("../modules/logger")
const database = require("../modules/database")
const { DefaultError } = require("../errors/errors")

async function getAdminById(id) {
    try {
        const sql = "SELECT id, username, createdAt FROM api_administrators WHERE id = ?"
        const rows = await database.query(sql, [id])
        return rows[0] || null
    } catch (error) {
        logger.log("Internal Server Error".bold + " : " + error.toString(), ["MariaDB", "yellow"])
        throw new DefaultError(500, "Internal Server Error", "Database Error")
    }
}

async function createAdmin(username, hashedPassword) {
    try {
        const sql = "INSERT INTO api_administrators (username, password) VALUES (?, ?)"
        const result = await database.query(sql, [username, hashedPassword])
        
        if (result.affectedRows > 0) {
            return { code: 200, id: result.insertId, username }
        } else {
            throw new DefaultError(500, "Failed to create administrator.")
        }
    } catch (error) {
        if (error.code === "ER_DUP_ENTRY") {
            throw new DefaultError(409, "Administrator username already exists.")
        }
        logger.log("Internal Server Error".bold + " : " + error.toString(), ["MariaDB", "yellow"])
        throw new DefaultError(500, "Internal Server Error", "Database Error")
    }
}

async function hasPermission(adminId, permissionKey) {
    try {
        const sql = `
            SELECT COUNT(*) as count
            FROM api_administrators_permissions
            WHERE administrator_id = ? AND permission_key = ?
        `
        const rows = await database.query(sql, [adminId, permissionKey])
        return rows[0].count === 1
    } catch (error) {
        logger.log("Internal Server Error".bold + " : " + error.toString(), ["MariaDB", "yellow"])
        throw new DefaultError(500, "Internal Server Error", "Database Error")
    }
}

async function assignPermission(adminId, permissionKey) {
    try {
        const sql = "INSERT INTO api_administrators_permissions (administrator_id, permission_key) VALUES (?, ?)"
        const result = await database.query(sql, [adminId, permissionKey])
        
        return result.affectedRows > 0
    } catch (error) {
        if (error.code === "ER_DUP_ENTRY") return true
        logger.log("Internal Server Error".bold + " : " + error.toString(), ["MariaDB", "yellow"])
        throw new DefaultError(500, "Internal Server Error", "Database Error")
    }
}

async function revokePermission(adminId, permissionKey) {
    try {
        const sql = "DELETE FROM api_administrators_permissions WHERE administrator_id = ? AND permission_key = ?"
        const result = await database.query(sql, [adminId, permissionKey])
        
        return result.affectedRows > 0
    } catch (error) {
        logger.log("Internal Server Error".bold + " : " + error.toString(), ["MariaDB", "yellow"])
        throw new DefaultError(500, "Internal Server Error", "Database Error")
    }
}

async function getAdminPermissions(adminId) {
    try {
        const sql = `
            SELECT permission_key 
            FROM api_administrators_permissions 
            WHERE administrator_id = ?
        `
        const rows = await database.query(sql, [adminId])
        return rows.map(r => r.permission_key)
    } catch (error) {
        logger.log("Internal Server Error".bold + " : " + error.toString(), ["MariaDB", "yellow"])
        throw new DefaultError(500, "Internal Server Error", "Database Error")
    }
}

async function updateAdminPassword(adminId, newHashedPassword) {
    try {
        const sql = "UPDATE api_administrators SET password = ? WHERE id = ?"
        const result = await database.query(sql, [newHashedPassword, adminId])

        if (result.affectedRows > 0) {
            return { 
                code: 200, 
                message: "Password updated successfully." 
            }
        } else {
            throw new DefaultError(404, "Administrator not found.")
        }
    } catch (error) {
        if (error instanceof DefaultError) throw error
        logger.log("Internal Server Error".bold + " : " + error.toString(), ["MariaDB", "yellow"])
        throw new DefaultError(500, "Internal Server Error", "Database Error")
    }
}

async function getAdminByUsername(username) {
    try {
        const sql = "SELECT id, username, password, createdAt FROM api_administrators WHERE username = ?"
        const rows = await database.query(sql, [username])
        
        return rows[0] || null
    } catch (error) {
        logger.log("Internal Server Error".bold + " : " + error.toString(), ["MariaDB", "yellow"])
        throw new DefaultError(500, "Internal Server Error", "Database Error")
    }
}

module.exports = {
    createAdmin,
    getAdminById,
    hasPermission,
    assignPermission,
    revokePermission,
    getAdminByUsername,
    getAdminPermissions,
    updateAdminPassword
}