// Copyright 2017 Frédéric Guillot. All rights reserved.
// Use of this source code is governed by the Apache 2.0
// license that can be found in the LICENSE file.

package model

import (
	"fmt"
	"time"
)

// Feed represents a feed in the database.
type Feed struct {
	ID                 int64     `json:"id"`
	UserID             int64     `json:"user_id"`
	FeedURL            string    `json:"feed_url"`
	SiteURL            string    `json:"site_url"`
	Title              string    `json:"title"`
	CheckedAt          time.Time `json:"checked_at"`
	EtagHeader         string    `json:"etag_header"`
	LastModifiedHeader string    `json:"last_modified_header"`
	ParsingErrorMsg    string    `json:"parsing_error_message"`
	ParsingErrorCount  int       `json:"parsing_error_count"`
	ScraperRules       string    `json:"scraper_rules"`
	RewriteRules       string    `json:"rewrite_rules"`
	Crawler            bool      `json:"crawler"`
	Category           *Category `json:"category,omitempty"`
	Entries            Entries   `json:"entries,omitempty"`
	Icon               *FeedIcon `json:"icon"`
}

func (f *Feed) String() string {
	return fmt.Sprintf("ID=%d, UserID=%d, FeedURL=%s, SiteURL=%s, Title=%s, Category={%s}",
		f.ID,
		f.UserID,
		f.FeedURL,
		f.SiteURL,
		f.Title,
		f.Category,
	)
}

// Merge combine override to the current struct
func (f *Feed) Merge(override *Feed) {
	if override.Title != "" && override.Title != f.Title {
		f.Title = override.Title
	}

	if override.SiteURL != "" && override.SiteURL != f.SiteURL {
		f.SiteURL = override.SiteURL
	}

	if override.FeedURL != "" && override.FeedURL != f.FeedURL {
		f.FeedURL = override.FeedURL
	}

	if override.ScraperRules != "" && override.ScraperRules != f.ScraperRules {
		f.ScraperRules = override.ScraperRules
	}

	if override.RewriteRules != "" && override.RewriteRules != f.RewriteRules {
		f.RewriteRules = override.RewriteRules
	}

	if override.Crawler != f.Crawler {
		f.Crawler = override.Crawler
	}

	if override.Category != nil && override.Category.ID != 0 && override.Category.ID != f.Category.ID {
		f.Category.ID = override.Category.ID
	}
}

// Feeds is a list of feed
type Feeds []*Feed