import { createClient } from '@libsql/client';
import { drizzle } from 'drizzle-orm/libsql';
import { sql, eq } from 'drizzle-orm';
import fs from 'fs';
import { arc, character, devilFruit, characterScrapeValidation, type DevilFruitType } from '../src/lib/server/db/schema';

type ArcRecord = {
	id: string;
	name: string;
	startChapter: number;
	endChapter?: number | null;
	url?: string | null;
};

type DevilFruitRecord = {
	id: string;
	name: string;
	type?: DevilFruitType | string | null;
	url?: string | null;
};

type CharacterRecord = {
	id: string;
	name: string;
	gender?: string | null;
	age?: number | null;
	affiliations?: string[] | string | null;
	devilFruitId?: string | null;
	hakiObservation?: boolean;
	hakiArmament?: boolean;
	hakiConqueror?: boolean;
	bounty?: number | null;
	height?: number | null;
	origin?: string | null;
	firstAppearance?: number;
	pictureUrl?: string | null;
	epithets?: string[] | string | null;
	status?: string | null;
	arcId?: string | null;
	url?: string | null;
};

const DATABASE_URL = process.env.DATABASE_URL || 'file:local.db';

const client = createClient({ url: DATABASE_URL });
const db = drizzle(client);

function readJsonFile<T>(path: string): T[] | null {
	if (!fs.existsSync(path)) {
		return null;
	}

	const content = fs.readFileSync(path, 'utf-8');
	return JSON.parse(content) as T[];
}

function toNullable<T>(value: T | undefined | null | ''): T | null {
	return value === undefined || value === null || value === '' ? null : value;
}

function toJsonArray(value: string[] | string | null | undefined): string[] | null {
	if (Array.isArray(value)) {
		return value.length > 0 ? value : null;
	}

	if (typeof value === 'string' && value.trim() !== '') {
		if (value.trim().startsWith('[')) {
			try {
				const parsed = JSON.parse(value);
				return Array.isArray(parsed) ? parsed : [value];
			} catch {
				return [value];
			}
		}

		const splitValues = value
			.split(',')
			.map((item) => item.trim())
			.filter(Boolean);

		return splitValues.length > 0 ? splitValues : null;
	}

	return null;
}

function toDevilFruitType(value: DevilFruitType | string | null | undefined): DevilFruitType | null {
	if (!value) return null;
	if (value === 'Paramecia' || value === 'Zoan' || value === 'Logia' || value === 'Unknown') {
		return value;
	}
	return 'Unknown';
}

function toNumber(value: string | number | null | undefined): number | null {
	if (value === null || value === undefined || value === '') return null;
	const num = typeof value === 'string' ? parseFloat(value) : value;
	return isNaN(num) ? null : num;
}

function getErrorMessage(error: unknown): string {
	return error instanceof Error ? error.message : String(error);
}

function logSqlOnError(statement: { sql: string; params: unknown[] } | null): void {
	if (!statement) return;
	console.error(`  SQL: ${statement.sql}`);
	console.error(`  Params: ${JSON.stringify(statement.params)}`);
}

function transformCharacterData(item: CharacterRecord) {
	return {
		id: item.id,
		name: item.name,
		gender: toNullable(item.gender),
		age: toNullable(item.age),
		affiliations: toJsonArray(item.affiliations),
		devilFruitId: toNullable(item.devilFruitId),
		hakiObservation: !!item.hakiObservation,
		hakiArmament: !!item.hakiArmament,
		hakiConqueror: !!item.hakiConqueror,
		bounty: item.bounty ?? 0,
		height: toNumber(item.height as any),
		origin: toNullable(item.origin),
		firstAppearance: item.firstAppearance ?? 0,
		pictureUrl: toNullable(item.pictureUrl),
		epithets: toJsonArray(item.epithets),
		status: toNullable(item.status),
		arcId: toNullable(item.arcId),
		url: toNullable(item.url)
	};
}

function hasChanged(jsonData: any, dbData: any): boolean {
	if (!dbData) return true;

    // Print any differences for debugging
    for (const key in jsonData) {
        const jsonValue = jsonData[key];
        const dbValue = dbData[key];
        const jsonString = typeof jsonValue === 'object' ? JSON.stringify(jsonValue) : String(jsonValue);
        const dbString = typeof dbValue === 'object' ? JSON.stringify(dbValue) : String(dbValue);
        if (jsonString !== dbString) {
            console.log(`\nField "${key}" changed for character ID ${jsonData.id}:`);
            console.log(`  JSON: ${jsonString}`);
            console.log(`  DB:   ${dbString}`);
        }   }
	
	// Compare each field
	return (
		jsonData.name != dbData.name ||
		jsonData.gender != dbData.gender ||
		jsonData.age != dbData.age ||
		JSON.stringify(jsonData.affiliations) != JSON.stringify(dbData.affiliations) ||
		jsonData.devilFruitId != dbData.devilFruitId ||
		jsonData.hakiObservation != dbData.hakiObservation ||
		jsonData.hakiArmament != dbData.hakiArmament ||
		jsonData.hakiConqueror != dbData.hakiConqueror ||
		jsonData.bounty != dbData.bounty ||
		jsonData.height != dbData.height ||
		jsonData.origin != dbData.origin ||
		jsonData.firstAppearance != dbData.firstAppearance ||
		jsonData.pictureUrl != dbData.pictureUrl ||
		JSON.stringify(jsonData.epithets) != JSON.stringify(dbData.epithets) ||
		jsonData.status != dbData.status ||
		jsonData.arcId != dbData.arcId ||
		jsonData.url != dbData.url
	);
}

async function isCharacterTableEmpty(): Promise<boolean> {
	const result = await db.select({ count: sql<number>`COUNT(*)` }).from(character);
	return result[0]?.count === 0;
}

async function importFromJson(): Promise<void> {
	let totalSuccess = 0;
	let totalErrors = 0;

	try {
		const arcs = readJsonFile<ArcRecord>('./scraped-data/arcs.json');
		if (arcs) {
			console.log('\n=== Importing Arcs ===\n');
			console.log(`Found ${arcs.length} arcs\n`);

			let successCount = 0;
			let errorCount = 0;

			for (let i = 0; i < arcs.length; i++) {
				const item = arcs[i];
				let lastSql: { sql: string; params: unknown[] } | null = null;
				try {
					const query = db
						.insert(arc)
						.values({
							id: item.id,
							name: item.name,
							startChapter: item.startChapter,
							endChapter: toNullable(item.endChapter),
							url: toNullable(item.url)
						})
						.onConflictDoUpdate({
							target: arc.id,
							set: {
								name: item.name,
								startChapter: item.startChapter,
								endChapter: toNullable(item.endChapter),
								url: toNullable(item.url)
							}
						});

					lastSql = query.toSQL();
					await query;

					successCount++;
					process.stdout.write(`\rExecuted: ${successCount}/${arcs.length}`);
				} catch (error) {
					errorCount++;
					console.error(`\n✗ Error at arc ${i + 1}:`);
					console.error(`  ID: ${item.id ?? 'N/A'}`);
					console.error(`  Message: ${getErrorMessage(error)}`);
					logSqlOnError(lastSql);
				}
			}

			console.log(`\n\n✓ Arcs imported!`);
			console.log(`  Success: ${successCount}`);
			console.log(`  Errors: ${errorCount}`);

			totalSuccess += successCount;
			totalErrors += errorCount;
		} else {
			console.log('\n⚠️  No arcs.json found, skipping...\n');
		}

		const fruits = readJsonFile<DevilFruitRecord>('./scraped-data/devil-fruits.json');
		if (fruits) {
			console.log('\n=== Importing Devil Fruits ===\n');
			console.log(`Found ${fruits.length} devil fruits\n`);

			let successCount = 0;
			let errorCount = 0;

			for (let i = 0; i < fruits.length; i++) {
				const item = fruits[i];
				let lastSql: { sql: string; params: unknown[] } | null = null;
				try {
					const query = db
						.insert(devilFruit)
						.values({
							id: item.id,
							name: item.name,
							type: toDevilFruitType(item.type),
							url: toNullable(item.url)
						})
						.onConflictDoUpdate({
							target: devilFruit.id,
							set: {
								name: item.name,
								type: toDevilFruitType(item.type),
								url: toNullable(item.url)
							}
						});

					lastSql = query.toSQL();
					await query;

					successCount++;
					process.stdout.write(`\rExecuted: ${successCount}/${fruits.length}`);
				} catch (error) {
					errorCount++;
					console.error(`\n✗ Error at devil fruit ${i + 1}:`);
					console.error(`  ID: ${item.id ?? 'N/A'}`);
					console.error(`  Message: ${getErrorMessage(error)}`);
					logSqlOnError(lastSql);
				}
			}

			console.log(`\n\n✓ Devil Fruits imported!`);
			console.log(`  Success: ${successCount}`);
			console.log(`  Errors: ${errorCount}`);

			totalSuccess += successCount;
			totalErrors += errorCount;
		} else {
			console.log('\n⚠️  No devil-fruits.json found, skipping...\n');
		}

		const characters = readJsonFile<CharacterRecord>('./scraped-data/characters.json');
		if (characters) {
			console.log('\n=== Importing Characters ===\n');
			console.log(`Found ${characters.length} characters\n`);

			const isEmpty = await isCharacterTableEmpty();

			let successCount = 0;
			let errorCount = 0;

			if (isEmpty) {
				// Populate empty character table
				console.log('Characters table is empty, populating...\n');

				for (let i = 0; i < characters.length; i++) {
					const item = characters[i];
					let lastSql: { sql: string; params: unknown[] } | null = null;
					try {
						const data = transformCharacterData(item);
						const query = db
							.insert(character)
							.values(data)
							.onConflictDoUpdate({
								target: character.id,
								set: data
							});

						lastSql = query.toSQL();
						await query;

						successCount++;
						process.stdout.write(`\rExecuted: ${successCount}/${characters.length}`);
					} catch (error) {
						errorCount++;
						console.error(`\n✗ Error at character ${i + 1}:`);
						console.error(`  ID: ${item.id ?? 'N/A'}`);
						console.error(`  Message: ${getErrorMessage(error)}`);
						logSqlOnError(lastSql);
					}
				}
			} else {
				// Check for changes and update scrapeValidation table
				console.log('Characters table not empty, checking for changes...\n');

				for (let i = 0; i < characters.length; i++) {
					const item = characters[i];
					let lastSql: { sql: string; params: unknown[] } | null = null;
					try {
						const selectQuery = db
							.select()
							.from(character)
							.where(eq(character.id, item.id));

						lastSql = selectQuery.toSQL();
						const [dbCharacter] = await selectQuery;

						const jsonData = transformCharacterData(item);
						const changed = hasChanged(jsonData, dbCharacter);

						if (changed) {
							// Update scrapeValidation table with changes
							const upsertQuery = db
								.insert(characterScrapeValidation)
								.values(jsonData)
								.onConflictDoUpdate({
									target: characterScrapeValidation.id,
									set: jsonData
								});

							lastSql = upsertQuery.toSQL();
							await upsertQuery;
						} else {
							// No changes, delete from scrapeValidation if it exists
							const deleteQuery = db
								.delete(characterScrapeValidation)
								.where(eq(characterScrapeValidation.id, item.id));

							lastSql = deleteQuery.toSQL();
							await deleteQuery;
						}

						successCount++;
						process.stdout.write(`\rProcessed: ${successCount}/${characters.length}`);
					} catch (error) {
						errorCount++;
						console.error(`\n✗ Error at character ${i + 1}:`);
						console.error(`  ID: ${item.id ?? 'N/A'}`);
						console.error(`  Message: ${getErrorMessage(error)}`);
						logSqlOnError(lastSql);
					}
				}
			}

			console.log(`\n\n✓ Characters imported!`);
			console.log(`  Success: ${successCount}`);
			console.log(`  Errors: ${errorCount}`);

			totalSuccess += successCount;
			totalErrors += errorCount;
		} else {
			console.log('\n⚠️  No characters.json found, skipping...\n');
		}

		console.log(`\n=== Total Import Summary ===`);
		console.log(`  Total Success: ${totalSuccess}`);
		console.log(`  Total Errors: ${totalErrors}\n`);
	} catch (error) {
		console.error('✗ Import failed:', getErrorMessage(error));
		process.exit(1);
	} finally {
		client.close();
	}
}

importFromJson().catch((error) => {
	console.error(getErrorMessage(error));
	process.exit(1);
});