import styleCss from './style.css'

import { logDebug, log, logError } from './utils/log'
import { getPricesToken } from './pricing/pricestf'
import itemQualities from 'tf2-static-schema/static/qualities.json';
import { getItemIndexByName, getTradableStatusByDefindex, ItemSchema, ItemSlot, prepareSchema, wipeSchema } from './schemaService'
import { $T, extractLocaleFromURL } from './utils/localization'
import { fetchPrice, fetchKeyPrice, ItemPriceData } from './priceService'
import { createPriceRow, createStoreButton } from './uiRenderer'
import { findFirstElement, findFirstChildElement } from './utils/dom'
import { extractPageTitleFromURL } from './utils/url';
import { ExchangeRates, prepareExchangeRates } from './exchangeRateService';
let itemSchema: ItemSchema | null;
let exchangeRates: ExchangeRates | null;

let locale: string = 'en'

/** Exclude these from the pricelist. */
const excludedQualities = new Set([
	15, // Decorated
	5,  // Unusual
]);

// Helper functions
function getKeyByValue<K extends string | number | symbol, V>(obj: Record<K, V>, value: V): K | undefined {
  for (const [key, val] of Object.entries(obj)) {
    if (val === value) {
      return key as unknown as K;
    }
  }
  return undefined;
}

// Main function
async function inject() {
	const itemInfobox = findFirstElement('.item-infobox');
	if (!itemInfobox) {
		// Not an item page
		return;
	}
	let itemIndex: number | null = null;
	let itemName: string | null = null;

	// Find buy buttons
	const buyButton = findFirstChildElement('.btn_buynow', itemInfobox);
	const marketButton = findFirstChildElement('.btn_buynow_market', itemInfobox);

	// Try using item name
	const header = findFirstChildElement('.infobox-header', itemInfobox);
	if (!itemIndex && header) {
		// Get <link rel="canonical" href='...'> from document.body
		const canonical = document.querySelector('link[rel="canonical"]');
		if (canonical && canonical instanceof HTMLLinkElement) {
			const url = canonical.href;
			if (url.indexOf("/wiki/") != -1) {
				itemName = extractPageTitleFromURL(url);
			}
		}

		if (itemName && !itemIndex) {
			itemIndex = getItemIndexByName(itemSchema, itemName)
		}
	}

	// Try using buy buttons, if they exist
	if(!itemIndex) {
		if(buyButton) {
			const link = (buyButton.parentElement as HTMLLinkElement);
			if(link && link.href) {
				itemIndex = parseInt(link.href.replace('https://store.steampowered.com/buyitem/440/', ''));
			}
		}

		if(!itemIndex && marketButton) {
			const link = (marketButton.parentElement as HTMLLinkElement);
			if(link && link.href) {
				itemIndex = parseInt(link.href.replace('https://steamcommunity.com/market/search/?q=appid:440+prop_def_index:', ''));
			}
		}
	}

	if (!itemIndex) {
		// Cannot continue without index
		logError(itemName ? `Could not find defindex for ${itemName}` : `Could not determine item defindex or name`);
		return;
	}

	// Prioritize name from item schema
	if(itemName !== itemSchema[itemIndex.toString()].name) {
		itemName = (itemSchema[itemIndex.toString()]).name
	}

	log(`Starting lookup for ${itemName} (defindex ${itemIndex})`);

	if(getTradableStatusByDefindex(itemSchema, itemIndex) == false) {
		log(`${itemName} is not tradable, exiting`)
		return;
	}

	const qualities: number[] = []

	const firstQualityTag = findFirstChildElement('.quality-tag', itemInfobox);

	for (const qualityTag of Array.from(firstQualityTag.parentElement.children)) {
		const link = findFirstChildElement('a', qualityTag) as HTMLLinkElement;
		if (!link) {
			continue;
		}
		const qualityName = extractPageTitleFromURL(link.href);
		const quality = parseInt(getKeyByValue(itemQualities, qualityName));
		if (!quality) {
			continue;
		}
		qualities.push(quality);
	}

	/// Create buttons

	// Item infobox is a table with the following layout:
	// 
	// th.infobox-header (Item Name)
	// tr (3D item viewer/2D preview image)
	// tr (buy buttons if applicable)
	// ... <- We want to insert our button here.
	// th.infobox-header (Basic Information)
	// ...

	const storeButtons: HTMLTableRowElement[] = [];

	// backpack.tf button
	storeButtons.push(createStoreButton("backpack.tf", new URL(`https://backpack.tf/classifieds?item=${encodeURIComponent(itemName)}`)));

	// mannco.store button
	storeButtons.push(createStoreButton("mannco.store", new URL(`https://mannco.store/tf2?&search=${encodeURIComponent(itemName)}&page=1`)));

	// marketplace.tf button
	// Disabled due to requiring login
	// storeButtons.push(createStoreButton("marketplace.tf", new URL(`https://marketplace.tf/browse/tf2?sterm=${encodeURIComponent(itemName)}`)));

	// stntrading.eu button
	storeButtons.push(createStoreButton("stntrading.eu", new URL(`https://stntrading.eu/item/tf2/${encodeURIComponent(itemName)}`)));

	const headers = itemInfobox.querySelectorAll("th.infobox-header");
	storeButtons.reverse().forEach(element => {
		if (marketButton) {
			marketButton.closest("tr").insertAdjacentElement('afterend', element);
		} else if (buyButton) {
			buyButton.closest("tr").insertAdjacentElement('afterend', element);
		} else if (headers.length > 2) {
			headers[1].closest("tr").insertAdjacentElement('beforebegin', element);
		} else {
			itemInfobox.children[0].appendChild(element);
		}
	});

	/// Create price infobox
	const priceInfoboxHeadingRow = document.createElement("tr")
	const priceInfoboxHeading = document.createElement("th")
	priceInfoboxHeading.className = "infobox-header"
	priceInfoboxHeading.colSpan = 2
	priceInfoboxHeading.innerText = $T("Community Pricing")
	priceInfoboxHeadingRow.appendChild(priceInfoboxHeading);
	headers[1].closest("tr").insertAdjacentElement('beforebegin', priceInfoboxHeadingRow);

	// Create progress bar
	const priceProgressRow = document.createElement("tr")
	const priceProgressData = document.createElement("td")
	priceProgressData.colSpan = 2
	const priceProgress = document.createElement("progress");
	priceProgress.id = "tf2wikipricing";
	priceProgress.style.width = "75%"
	priceProgress.style.marginLeft = "12.5%"
	priceProgressData.appendChild(priceProgress);
	priceProgressRow.appendChild(priceProgressData);
	priceInfoboxHeadingRow.insertAdjacentElement('afterend', priceProgressRow);

	let token: string | null;

	// Steam Community Market
	// TODO: Change this to lazy-load, so that it doesn't make network requests when we have cached data.
	// var steamMarketResults = await getSteamResults(itemName)
	// logDebug(JSON.stringify(steamMarketResults))

	// Fetch prices.tf access token
	// https://api2.prices.tf/auth/access
	try {
		// throw new Error('dont wanna')
		token = await getPricesToken();
	} catch (err) {
		log('Failed to get an access token for prices.tf: ' + err);
	}

	let updateTime: Date | null = null;

	enum PriceRowCategory {
		None,
		Festive,
		Botkiller,
		KillstreakKit
	}

	interface PriceRow {
		order: number
		row: HTMLTableRowElement
		category: PriceRowCategory
	}
	const priceRows: PriceRow[]= [];

	// Get current key price
	const keyPrice = await fetchKeyPrice(token);

	const currentTime = new Date()

	const promises = qualities.filter(x => !excludedQualities.has(x)).map(async (quality) => {

		const qualifiedName = ((quality != 6 ? itemQualities[quality as unknown as keyof typeof itemQualities].toString() : '') + ' ' + itemName).trim()
		// logDebug(`Fetching price for ${qualifiedName}`)

		let data: ItemPriceData | null
		try {
			data = await fetchPrice(token, itemIndex + ";" + quality, currentTime);
			updateTime = new Date(data.update)
		} catch {
			log(`${qualifiedName} is unpriced or unavailable, skipping...`)
		}

		const qualityName = itemQualities[quality as unknown as keyof typeof itemQualities].toString()
		const priceRow = createPriceRow(qualityName, data, keyPrice, exchangeRates, locale)

		priceRows.push({order: quality == 6 ? -1 : quality, row: priceRow, category: PriceRowCategory.None})
	})

	// Check item schema for Australium variant of current defindex
	if(itemSchema[itemIndex].hasAustraliumVariant) {
		promises.push(fetchPrice(token, `${itemIndex};11;australium`, currentTime).then(data => {
			updateTime = new Date(data.update)
			log(`Saving price for Australium ${itemName}`)

			const priceRow = createPriceRow($T("Australium"), data, keyPrice, exchangeRates, locale, "https://wiki.teamfortress.com/wiki/Australium_weapons")

			priceRows.push({order: 99, row: priceRow, category: PriceRowCategory.None})
		})
		.catch((error) => {
			logError(error)
			log(`Australium ${itemName} is unpriced or unavailable, skipping...`)
		}))
	}

	let festiveHeadingRow: HTMLTableRowElement | null
	// Check item schema for Festive variant of current defindex
	if(itemSchema[itemIndex].festiveVariant != null) {
		/// Create subheading
		festiveHeadingRow = document.createElement("tr")
		const festiveHeading = document.createElement("th")
		festiveHeading.className = "infobox-subheader"
		festiveHeading.colSpan = 2
		festiveHeading.innerText = $T("Festive")
		festiveHeading.style.fontSize = '1em';
		festiveHeading.style.backgroundColor = '#F5C087';
		festiveHeadingRow.style.display = 'none';
		festiveHeadingRow.appendChild(festiveHeading);

		promises.push(fetchPrice(token, `${itemSchema[itemIndex].festiveVariant};6`, currentTime).then(data => {
			updateTime = new Date(data.update)
			log(`updateTime price for Festive ${itemName}`)

			const priceRow = createPriceRow($T("Unique"), data, keyPrice, exchangeRates, locale)

			priceRows.push({order: -1, row: priceRow, category: PriceRowCategory.Festive})
		})
		.catch((error) => {
			logError(error)
			log(`Festive ${itemName} is unpriced or unavailable, skipping...`)
		}))
		promises.push(fetchPrice(token, `${itemSchema[itemIndex].festiveVariant};11`, currentTime).then(data => {
			updateTime = new Date(data.update)
			log(`Saving price for Strange Festive ${itemName}`)

			const priceRow = createPriceRow($T("Strange"), data, keyPrice, exchangeRates, locale)

			priceRows.push({order: 11, row: priceRow, category: PriceRowCategory.Festive})
		})
		.catch((error) => {
			logError(error)
			log(`Strange Festive ${itemName} is unpriced or unavailable, skipping...`)
		}))
	}

	let killstreakKitHeadingRow: HTMLTableRowElement | null
	// Check for Killstreak Kits
	if(itemSchema[itemIndex].slot == ItemSlot.Primary ||
		 itemSchema[itemIndex].slot == ItemSlot.Secondary ||
		 itemSchema[itemIndex].slot == ItemSlot.Melee)
	{
		/// Create subheading
		killstreakKitHeadingRow = document.createElement("tr")
		const heading = document.createElement("th")
		heading.className = "infobox-subheader"
		heading.colSpan = 2
		heading.innerText = $T("Killstreak Kit")
		heading.style.fontSize = '1em';
		heading.style.backgroundColor = '#F5C087';
		killstreakKitHeadingRow.style.display = 'none';
		killstreakKitHeadingRow.appendChild(heading);
		[1,2,3].map((tier) => {
			let kitIndex: number
			switch (tier) {
				default:
				case 1: kitIndex = 6527; break;
				case 2: kitIndex = 6523; break;
				case 3: kitIndex = 6526; break;
			}
			promises.push(fetchPrice(token, `${kitIndex};6;uncraftable;kt-${tier};td-${itemIndex}`, currentTime).then(data => {
				updateTime = new Date(data.update)
				logDebug(`Saving price for ${itemName} Killstreak Kit Tier ${tier}`)

				const priceRow = createPriceRow($T(`kt-${tier}`), data, keyPrice, exchangeRates, locale, "https://wiki.teamfortress.com/wiki/Killstreak_Kit")

				priceRows.push({order: tier, row: priceRow, category: PriceRowCategory.KillstreakKit})
			})
			.catch((error) => {
				logError(`Failed to fetch price for ${itemName} Killstreak Kit Tier ${tier}`, error)
			}))
		})
	}

	// Silver Mk.I, Gold Mk.II, Rust, Blood, Carbonado, Diamond, Silver Mk.II, Gold Mk.II
	const botkillerOrder = [
		"Silver",
		"Gold",
		"Rust",
		"Blood",
		"Carbonado",
		"Diamond",
		"Silver Mk.II",
		"Gold Mk.II",
	]
	let botKillerHeadingRow: HTMLTableRowElement | null
	if(itemSchema[itemIndex].botkillerVariants != null && itemSchema[itemIndex].botkillerVariants.length > 0) {
		/// Create subheading
		botKillerHeadingRow = document.createElement("tr")
		const festiveHeading = document.createElement("th")
		festiveHeading.className = "infobox-subheader"
		festiveHeading.colSpan = 2
		festiveHeading.innerText = $T("Botkiller")
		festiveHeading.style.fontSize = '1em';
		festiveHeading.style.backgroundColor = '#F5C087';
		botKillerHeadingRow.style.display = 'none';
		botKillerHeadingRow.appendChild(festiveHeading);

		itemSchema[itemIndex].botkillerVariants.map((variantIndex) => {
			const itemName = itemSchema[variantIndex].name
			// FIXME: variantName should match wiki display name
			const variantName = itemName.includes('Mk.II') ? itemName.split(' ')[0] + ' Mk.II' : itemName.split(' ')[0]
			promises.push(fetchPrice(token, `${variantIndex};11`, currentTime).then(data => {
				logDebug(`Saving price for ${itemName}`)
				updateTime = new Date(data.update)

				const priceRow = createPriceRow($T(variantName), data, keyPrice, exchangeRates, locale, "https://wiki.teamfortress.com/wiki/Botkiller_weapons")

				priceRows.push({order: botkillerOrder.indexOf(variantName), row: priceRow, category: PriceRowCategory.Botkiller})
			})
			.catch((error) => {
				logError(error)
				log(`Strange Festive ${itemName} is unpriced or unavailable, skipping...`)
			}))
		})
	}

	if(killstreakKitHeadingRow) priceInfoboxHeadingRow.insertAdjacentElement('afterend', killstreakKitHeadingRow);
	if(botKillerHeadingRow) priceInfoboxHeadingRow.insertAdjacentElement('afterend', botKillerHeadingRow);
	if(festiveHeadingRow) priceInfoboxHeadingRow.insertAdjacentElement('afterend', festiveHeadingRow);

	Promise.all(promises).then(() => {
		priceRows.sort((a, b) => {
			if (a.category != b.category) {
					return a.category - b.category;
			}
			return a.order - b.order;
		}).reverse().forEach((element) => {
			switch(element.category) {
				case PriceRowCategory.None:
					priceInfoboxHeadingRow.insertAdjacentElement('afterend', element.row);
					break;
				case PriceRowCategory.Festive:
					festiveHeadingRow.insertAdjacentElement('afterend', element.row);
					festiveHeadingRow.style.display = 'revert';
					break;
				case PriceRowCategory.Botkiller:
					botKillerHeadingRow.insertAdjacentElement('afterend', element.row);
					botKillerHeadingRow.style.display = 'revert';
					break;
				case PriceRowCategory.KillstreakKit:
					killstreakKitHeadingRow.insertAdjacentElement('afterend', element.row);
					killstreakKitHeadingRow.style.display = 'revert';
			}
		})
		if(!updateTime || !(updateTime instanceof Date) || isNaN(+updateTime)) updateTime = new Date()

		// Footer row
		const row = document.createElement("tr");

		const label = document.createElement("td");
		label.colSpan = 2;
		label.style.fontSize = "85%";
		label.style.textAlign = "center";
		const updateText = $T("Updated %@.", locale).replace('%@', updateTime.toLocaleString(locale, { year: 'numeric', month: 'long', day: 'numeric', hour: '2-digit', minute: '2-digit', timeZoneName: 'short' }))
		const attributionHeader = $T("Acknowledgements");
		const pricesAttribution = `<a rel="nofollow" class="external text" href="https://prices.tf">prices.tf</a>`;
		const exchangeRateAttribution = `<a rel="nofollow" class="external text" href="https://www.exchangerate-api.com">Rates By Exchange Rate API</a>`;
		label.innerHTML = `${updateText}<br><b>${attributionHeader}</b><br>${pricesAttribution}<br>${exchangeRateAttribution}`;
		row.appendChild(label);

		priceProgressRow.insertAdjacentElement('afterend', row);
		priceProgressRow.remove()
	})
}

function addStyles() {
	const head = document.head || document.getElementsByTagName('head')[0],
		style = document.createElement('style');
	head.appendChild(style);
	style.innerHTML = styleCss;
}

prepareSchema()
.then(schema => {
	itemSchema = schema;
	if (!itemSchema) {
		wipeSchema(); // FIXME: ugly hack. requires additional page reload. if prepareSchema returns null, we should handle it properly
		throw new Error("No item schema ready");
	}
})
.then(prepareExchangeRates)
.then(rates => exchangeRates = rates)
.then(() => {
	locale = extractLocaleFromURL(document.URL)
	addStyles();
	inject();
	// TODO: Purge expired price data
})
.catch((error) => {
	logError(error);
})