import { Builder } from '../utils/builder'
import { Config, Http } from '../utils/generate'
import { Client } from '../utils/registry'
import { GetContentType, HasBody, IsStringBody, IsObjectBody, ContentTypeIncludes } from '../utils/utils'

export default {
  default: true,
  language: 'dart',
  client: 'http',
  generate(config: Config, http: Http): string {
    const builder = new Builder({
      indent: config.indent || '  ',
      join: config.join || '\n'
    })

    const hasBody = HasBody(http.body)
    const contentType = GetContentType(http.headers)
    const needsJsonEncode =
      hasBody && (ContentTypeIncludes(contentType, 'json') || (!contentType && IsObjectBody(http.body)))

    builder.line("import 'package:http/http.dart' as http;")
    if (needsJsonEncode) {
      builder.line("import 'dart:convert';")
    }
    builder.line()

    builder.line('void main() async {')
    builder.indent()

    if (config.handleErrors) {
      builder.line('try {')
      builder.indent()
    }

    // Build URL with parameters
    if (http.params && Object.keys(http.params).length > 0) {
      builder.line("var url = Uri.parse('" + http.url + "').replace(queryParameters: {")
      builder.indent()
      for (const [key, value] of Object.entries(http.params)) {
        if (Array.isArray(value)) {
          builder.line(`'${key}': [${value.map((v) => `'${v}'`).join(', ')}],`)
        } else {
          builder.line(`'${key}': '${value}',`)
        }
      }
      builder.outdent()
      builder.line('});')
    } else {
      builder.line(`var url = Uri.parse('${http.url}');`)
    }
    builder.line()

    // Build headers map
    if (http.headers && Object.keys(http.headers).length > 0) {
      builder.line('var headers = {')
      builder.indent()
      for (const [key, value] of Object.entries(http.headers)) {
        if (Array.isArray(value)) {
          builder.line(`'${key}': '${value.join(', ')}',`)
        } else {
          builder.line(`'${key}': '${value}',`)
        }
      }
      builder.outdent()
      builder.line('};')
      builder.line()
    }

    // Build body
    let bodyVar = 'null'
    if (hasBody) {
      if (ContentTypeIncludes(contentType, 'json') || (!contentType && IsObjectBody(http.body))) {
        builder.line('var body = jsonEncode(')
        builder.json(http.body)
        builder.append(');')
        bodyVar = 'body'
        builder.line()
      } else if (IsStringBody(http.body)) {
        builder.line(`var body = '${http.body.replace(/'/g, "\\'")}';`)
        bodyVar = 'body'
        builder.line()
      }
    }

    // Make request
    const method = http.method.toLowerCase()
    const hasHeaders = http.headers && Object.keys(http.headers).length > 0

    if (method === 'get') {
      builder.line(`var response = await http.get(url${hasHeaders ? ', headers: headers' : ''});`)
    } else if (method === 'post') {
      builder.line(
        `var response = await http.post(url${hasHeaders ? ', headers: headers' : ''}${bodyVar !== 'null' ? ', body: ' + bodyVar : ''});`
      )
    } else if (method === 'put') {
      builder.line(
        `var response = await http.put(url${hasHeaders ? ', headers: headers' : ''}${bodyVar !== 'null' ? ', body: ' + bodyVar : ''});`
      )
    } else if (method === 'delete') {
      builder.line(
        `var response = await http.delete(url${hasHeaders ? ', headers: headers' : ''}${bodyVar !== 'null' ? ', body: ' + bodyVar : ''});`
      )
    } else if (method === 'patch') {
      builder.line(
        `var response = await http.patch(url${hasHeaders ? ', headers: headers' : ''}${bodyVar !== 'null' ? ', body: ' + bodyVar : ''});`
      )
    }

    builder.line()
    builder.line('print(response.body);')

    if (config.handleErrors) {
      builder.outdent()
      builder.line('} catch (e) {')
      builder.indent()
      builder.line('print("Error: $e");')
      builder.outdent()
      builder.line('}')
    }

    builder.outdent()
    builder.line('}')

    return builder.output()
  }
} as Client