package cloudflare

import (
	"encoding/json"
	"time"

	"github.com/pkg/errors"
)

// PageRuleTarget is the target to evaluate on a request.
//
// Currently Target must always be "url" and Operator must be "matches". Value
// is the URL pattern to match against.
type PageRuleTarget struct {
	Target     string `json:"target"`
	Constraint struct {
		Operator string `json:"operator"`
		Value    string `json:"value"`
	} `json:"constraint"`
}

/*
PageRuleAction is the action to take when the target is matched.

Valid IDs are:
  always_online
  always_use_https
  automatic_https_rewrites
  browser_cache_ttl
  browser_check
  bypass_cache_on_cookie
  cache_by_device_type
  cache_deception_armor
  cache_level
  cache_on_cookie
  disable_apps
  disable_performance
  disable_railgun
  disable_security
  edge_cache_ttl
  email_obfuscation
  explicit_cache_control
  forwarding_url
  host_header_override
  ip_geolocation
  minify
  mirage
  opportunistic_encryption
  origin_error_page_pass_thru
  polish
  resolve_override
  respect_strong_etag
  response_buffering
  rocket_loader
  security_level
  server_side_exclude
  sort_query_string_for_cache
  ssl
  true_client_ip_header
  waf
*/
type PageRuleAction struct {
	ID    string      `json:"id"`
	Value interface{} `json:"value"`
}

// PageRuleActions maps API action IDs to human-readable strings.
var PageRuleActions = map[string]string{
	"always_online":               "Always Online",               // Value of type string
	"always_use_https":            "Always Use HTTPS",            // Value of type interface{}
	"automatic_https_rewrites":    "Automatic HTTPS Rewrites",    // Value of type string
	"browser_cache_ttl":           "Browser Cache TTL",           // Value of type int
	"browser_check":               "Browser Integrity Check",     // Value of type string
	"bypass_cache_on_cookie":      "Bypass Cache on Cookie",      // Value of type string
	"cache_by_device_type":        "Cache By Device Type",        // Value of type string
	"cache_deception_armor":       "Cache Deception Armor",       // Value of type string
	"cache_level":                 "Cache Level",                 // Value of type string
	"cache_on_cookie":             "Cache On Cookie",             // Value of type string
	"disable_apps":                "Disable Apps",                // Value of type interface{}
	"disable_performance":         "Disable Performance",         // Value of type interface{}
	"disable_railgun":             "Disable Railgun",             // Value of type string
	"disable_security":            "Disable Security",            // Value of type interface{}
	"edge_cache_ttl":              "Edge Cache TTL",              // Value of type int
	"email_obfuscation":           "Email Obfuscation",           // Value of type string
	"explicit_cache_control":      "Origin Cache Control",        // Value of type string
	"forwarding_url":              "Forwarding URL",              // Value of type map[string]interface
	"host_header_override":        "Host Header Override",        // Value of type string
	"ip_geolocation":              "IP Geolocation Header",       // Value of type string
	"minify":                      "Minify",                      // Value of type map[string]interface
	"mirage":                      "Mirage",                      // Value of type string
	"opportunistic_encryption":    "Opportunistic Encryption",    // Value of type string
	"origin_error_page_pass_thru": "Origin Error Page Pass-thru", // Value of type string
	"polish":                      "Polish",                      // Value of type string
	"resolve_override":            "Resolve Override",            // Value of type string
	"respect_strong_etag":         "Respect Strong ETags",        // Value of type string
	"response_buffering":          "Response Buffering",          // Value of type string
	"rocket_loader":               "Rocker Loader",               // Value of type string
	"security_level":              "Security Level",              // Value of type string
	"server_side_exclude":         "Server Side Excludes",        // Value of type string
	"sort_query_string_for_cache": "Query String Sort",           // Value of type string
	"ssl":                         "SSL",                         // Value of type string
	"true_client_ip_header":       "True Client IP Header",       // Value of type string
	"waf":                         "Web Application Firewall",    // Value of type string
}

// PageRule describes a Page Rule.
type PageRule struct {
	ID         string           `json:"id,omitempty"`
	Targets    []PageRuleTarget `json:"targets"`
	Actions    []PageRuleAction `json:"actions"`
	Priority   int              `json:"priority"`
	Status     string           `json:"status"` // can be: active, paused
	ModifiedOn time.Time        `json:"modified_on,omitempty"`
	CreatedOn  time.Time        `json:"created_on,omitempty"`
}

// PageRuleDetailResponse is the API response, containing a single PageRule.
type PageRuleDetailResponse struct {
	Success  bool     `json:"success"`
	Errors   []string `json:"errors"`
	Messages []string `json:"messages"`
	Result   PageRule `json:"result"`
}

// PageRulesResponse is the API response, containing an array of PageRules.
type PageRulesResponse struct {
	Success  bool       `json:"success"`
	Errors   []string   `json:"errors"`
	Messages []string   `json:"messages"`
	Result   []PageRule `json:"result"`
}

// CreatePageRule creates a new Page Rule for a zone.
//
// API reference: https://api.cloudflare.com/#page-rules-for-a-zone-create-a-page-rule
func (api *API) CreatePageRule(zoneID string, rule PageRule) (*PageRule, error) {
	uri := "/zones/" + zoneID + "/pagerules"
	res, err := api.makeRequest("POST", uri, rule)
	if err != nil {
		return nil, errors.Wrap(err, errMakeRequestError)
	}
	var r PageRuleDetailResponse
	err = json.Unmarshal(res, &r)
	if err != nil {
		return nil, errors.Wrap(err, errUnmarshalError)
	}
	return &r.Result, nil
}

// ListPageRules returns all Page Rules for a zone.
//
// API reference: https://api.cloudflare.com/#page-rules-for-a-zone-list-page-rules
func (api *API) ListPageRules(zoneID string) ([]PageRule, error) {
	uri := "/zones/" + zoneID + "/pagerules"
	res, err := api.makeRequest("GET", uri, nil)
	if err != nil {
		return []PageRule{}, errors.Wrap(err, errMakeRequestError)
	}
	var r PageRulesResponse
	err = json.Unmarshal(res, &r)
	if err != nil {
		return []PageRule{}, errors.Wrap(err, errUnmarshalError)
	}
	return r.Result, nil
}

// PageRule fetches detail about one Page Rule for a zone.
//
// API reference: https://api.cloudflare.com/#page-rules-for-a-zone-page-rule-details
func (api *API) PageRule(zoneID, ruleID string) (PageRule, error) {
	uri := "/zones/" + zoneID + "/pagerules/" + ruleID
	res, err := api.makeRequest("GET", uri, nil)
	if err != nil {
		return PageRule{}, errors.Wrap(err, errMakeRequestError)
	}
	var r PageRuleDetailResponse
	err = json.Unmarshal(res, &r)
	if err != nil {
		return PageRule{}, errors.Wrap(err, errUnmarshalError)
	}
	return r.Result, nil
}

// ChangePageRule lets you change individual settings for a Page Rule. This is
// in contrast to UpdatePageRule which replaces the entire Page Rule.
//
// API reference: https://api.cloudflare.com/#page-rules-for-a-zone-change-a-page-rule
func (api *API) ChangePageRule(zoneID, ruleID string, rule PageRule) error {
	uri := "/zones/" + zoneID + "/pagerules/" + ruleID
	res, err := api.makeRequest("PATCH", uri, rule)
	if err != nil {
		return errors.Wrap(err, errMakeRequestError)
	}
	var r PageRuleDetailResponse
	err = json.Unmarshal(res, &r)
	if err != nil {
		return errors.Wrap(err, errUnmarshalError)
	}
	return nil
}

// UpdatePageRule lets you replace a Page Rule. This is in contrast to
// ChangePageRule which lets you change individual settings.
//
// API reference: https://api.cloudflare.com/#page-rules-for-a-zone-update-a-page-rule
func (api *API) UpdatePageRule(zoneID, ruleID string, rule PageRule) error {
	uri := "/zones/" + zoneID + "/pagerules/" + ruleID
	res, err := api.makeRequest("PUT", uri, rule)
	if err != nil {
		return errors.Wrap(err, errMakeRequestError)
	}
	var r PageRuleDetailResponse
	err = json.Unmarshal(res, &r)
	if err != nil {
		return errors.Wrap(err, errUnmarshalError)
	}
	return nil
}

// DeletePageRule deletes a Page Rule for a zone.
//
// API reference: https://api.cloudflare.com/#page-rules-for-a-zone-delete-a-page-rule
func (api *API) DeletePageRule(zoneID, ruleID string) error {
	uri := "/zones/" + zoneID + "/pagerules/" + ruleID
	res, err := api.makeRequest("DELETE", uri, nil)
	if err != nil {
		return errors.Wrap(err, errMakeRequestError)
	}
	var r PageRuleDetailResponse
	err = json.Unmarshal(res, &r)
	if err != nil {
		return errors.Wrap(err, errUnmarshalError)
	}
	return nil
}