-- furt-lua/src/routes/mail.lua
-- Mail service route handler
-- Dragons@Work Digital Sovereignty Project

local cjson = require("cjson")

local MailRoute = {}

-- Load configuration
local config = require("config.server")

-- Validate email format
local function validate_email(email)
    return email and email:match("^[^@]+@[^@]+%.[^@]+$") ~= nil
end

-- Validate required fields
local function validate_mail_data(data)
    if not data.name or type(data.name) ~= "string" or data.name:match("^%s*$") then
        return false, "Name is required and cannot be empty"
    end
    
    if not data.email or not validate_email(data.email) then
        return false, "Valid email address is required"
    end
    
    if not data.message or type(data.message) ~= "string" or data.message:match("^%s*$") then
        return false, "Message is required and cannot be empty"
    end
    
    -- Optional subject validation
    if data.subject and (type(data.subject) ~= "string" or #data.subject > 200) then
        return false, "Subject must be a string with max 200 characters"
    end
    
    -- Message length validation
    if #data.message > 5000 then
        return false, "Message too long (max 5000 characters)"
    end
    
    return true
end

-- Generate unique request ID
local function generate_request_id()
    return os.time() .. "-" .. math.random(1000, 9999)
end

-- Mail service handler
function MailRoute.handle_mail_send(request, server)
    print("Mail endpoint called - Method: " .. request.method .. ", Path: " .. request.path)
    print("Authenticated as: " .. request.auth.key_name .. " (" .. request.auth.api_key .. ")")
    
    -- Basic request validation
    if not request.body or request.body == "" then
        return {error = "No request body", code = "MISSING_BODY"}
    end
    
    -- Parse JSON
    local success, data = pcall(cjson.decode, request.body)
    if not success then
        return {error = "Invalid JSON", body = request.body, code = "INVALID_JSON"}
    end
    
    -- Validate mail data
    local valid, error_message = validate_mail_data(data)
    if not valid then
        return {error = error_message, code = "VALIDATION_ERROR"}
    end
    
    -- Generate request ID for tracking
    local request_id = generate_request_id()
    
    -- Prepare email content
    local subject = data.subject or "Contact Form Message"
    local email_content = string.format(
        "From: %s <%s>\nSubject: %s\n\n%s", 
        data.name, data.email, subject, data.message
    )
    
    -- Send email via SMTP
    local SMTP = require("src.smtp")
    local smtp_client = SMTP:new(config.mail)
    
    local smtp_success, smtp_result = smtp_client:send_email(
        config.mail.to_address, 
        subject, 
        email_content, 
        data.name
    )
    
    if smtp_success then
        -- Success response
        return {
            success = true, 
            message = "Mail sent successfully", 
            request_id = request_id,
            api_key_name = request.auth.key_name
        }
    else
        -- SMTP error - log and return error
        print("SMTP Error: " .. tostring(smtp_result))
        return server:create_response(500, {
            success = false, 
            error = "Failed to send email: " .. tostring(smtp_result), 
            request_id = request_id,
            code = "SMTP_ERROR"
        }, nil, nil, request)
    end
end

return MailRoute