package main

import (
	"fmt"
	"log"
	"net/url"
)

// config accepts a slice of type Redirect and returns an error
// it organizes the data from the input redirects in a way that makes sense for FortiOS objects
// then outputs the configuration to stdout
func config(redirects []Redirect) error {

	// A map which contains the name of a redirect policy as the key, and a slice of strings as a value.
	//  The value of the string is the name of the url-rewrite-rule which needs to be referenced by the redirect policy object in FortiOS
	redirectPolicies := make(map[string][]string)

	// Iterate over all redirects and output url-rewrite-rules

	fmt.Printf("\n\n------------------------\n\n\n")
	fmt.Println("config waf url-rewrite url-rewrite-rule")
	for _, redirect := range redirects {
		sourceURL, err := url.Parse(redirect.sourceURL)
		if err != nil {
			log.Printf("skipping redirect: unable to parse source URL '%s': %v", redirect.sourceURL, err)
			continue
		}

		fmt.Printf("edit \"%s\"\n", redirect.sourceURL)
		fmt.Println("set action redirect")
		fmt.Printf("set location %s\n", redirect.destinationURL)
		fmt.Println("set action redirect")
		fmt.Println("config match-condition")
		fmt.Println("edit 0")
		fmt.Println("set object http-url")
		fmt.Printf("set reg-exp %s\n", sourceURL.Path)
		fmt.Println("set protocol-filter enable")
		fmt.Printf("set HTTP-protocol %s\n", sourceURL.Scheme)
		fmt.Println("next")
		fmt.Println("end")
		fmt.Println("next")

		// Add this rule to the policy map
		redirectPolicies[sourceURL.Host] = append(redirectPolicies[sourceURL.Host], redirect.sourceURL)
	}
	fmt.Println("end")

	// Iterate over values in the policy map and output the policy configuration
	fmt.Println("config waf url-rewrite url-rewrite-policy")
	for policyName, policyRules := range redirectPolicies {
		fmt.Printf("edit \"%s\"\n", policyName)
		for _, ruleName := range policyRules {
			fmt.Println("edit 0")
			fmt.Printf("set url-rewrite-rule-name %s-redirects\n", ruleName)
			fmt.Println("next")
			fmt.Println("end")
		}
		fmt.Println("next")
	}
	fmt.Println("end")

	return nil
}