import { untrustedSql } from '@supabase/pg-meta'
import { z, type SafeParseReturnType } from 'zod'

// Splits markdown into alternating [plain, code, plain, code, ...] segments.
// Odd-indexed segments are already inside code spans/fences and should be left alone.
const CODE_SEGMENT_REGEX = /(```[\s\S]*?```|`[^`]*`)/g

// Matches bare placeholder URLs like https://xxx/<project-ref>/... outside markdown link
// syntax. Stops at whitespace, ), or ] to avoid consuming link delimiters. Trailing prose
// punctuation is stripped in the replacement callback below.
const PLACEHOLDER_URL_REGEX = /(?<!\()https?:\/\/[^\s)\]]*<[a-z][a-z0-9]*(?:-[a-z0-9]+)*>[^\s)\]]*/g

/**
 * Wraps bare URLs containing <placeholder> patterns in backticks so they render in
 * code font, regardless of whether the LLM remembered to wrap them.
 */
export function wrapPlaceholderUrls(markdown: string): string {
  if (!markdown.includes('<')) return markdown
  const segments = markdown.split(CODE_SEGMENT_REGEX)
  return segments
    .map((segment, i) => {
      if (i % 2 === 1) return segment
      return segment.replace(PLACEHOLDER_URL_REGEX, (url) => {
        const trailingPunct = url.match(/[.,;:!?'"]+$/)?.[0] ?? ''
        const cleanUrl = url.slice(0, url.length - trailingPunct.length)
        return `\`${cleanUrl}\`` + trailingPunct
      })
    })
    .join('')
}

// [Joshen] From https://github.com/remarkjs/react-markdown/blob/fda7fa560bec901a6103e195f9b1979dab543b17/lib/index.js#L425
export function defaultUrlTransform(value: string) {
  const safeProtocol = /^(https?|ircs?|mailto|xmpp)$/i
  const colon = value.indexOf(':')
  const questionMark = value.indexOf('?')
  const numberSign = value.indexOf('#')
  const slash = value.indexOf('/')

  if (
    // If there is no protocol, it’s relative.
    colon === -1 ||
    // If the first colon is after a `?`, `#`, or `/`, it’s not a protocol.
    (slash !== -1 && colon > slash) ||
    (questionMark !== -1 && colon > questionMark) ||
    (numberSign !== -1 && colon > numberSign) ||
    // It is a protocol, it should be allowed.
    safeProtocol.test(value.slice(0, colon))
  ) {
    return value
  }

  return ''
}

const chartArgsSchema = z
  .object({
    view: z.enum(['table', 'chart']).optional(),
    xKey: z.string().optional(),
    xAxis: z.string().optional(),
    yKey: z.string().optional(),
    yAxis: z.string().optional(),
  })
  .passthrough()

const chartArgsFieldSchema = z.preprocess((value) => {
  if (!value || typeof value !== 'object') return undefined
  if (Array.isArray(value)) return value[0]
  return value
}, chartArgsSchema.optional())

const executeSqlChartResultSchema = z
  .object({
    sql: z.string().optional(),
    label: z.string().optional(),
    isWriteQuery: z.boolean().optional(),
    chartConfig: chartArgsFieldSchema,
    config: chartArgsFieldSchema,
  })
  .passthrough()
  .transform(({ sql, label, isWriteQuery, chartConfig, config }) => {
    const chartArgs = chartConfig ?? config

    return {
      sql: untrustedSql(sql ?? ''),
      label,
      isWriteQuery,
      view: chartArgs?.view,
      xAxis: chartArgs?.xKey ?? chartArgs?.xAxis,
      yAxis: chartArgs?.yKey ?? chartArgs?.yAxis,
    }
  })

export function parseExecuteSqlChartResult(
  input: unknown
): SafeParseReturnType<unknown, z.infer<typeof executeSqlChartResultSchema>> {
  return executeSqlChartResultSchema.safeParse(input)
}

export const deployEdgeFunctionInputSchema = z
  .object({
    code: z.string().min(1),
    name: z.string().trim().optional(),
    slug: z.string().trim().optional(),
    functionName: z.string().trim().optional(),
    label: z.string().optional(),
  })
  .passthrough()
  .transform((data) => {
    const rawName = data.functionName ?? data.name ?? data.slug
    const trimmedName = rawName?.trim()
    const functionName = trimmedName && trimmedName.length > 0 ? trimmedName : 'my-function'

    const rawLabel = data.label ?? rawName
    const trimmedLabel = rawLabel?.trim()
    const label = trimmedLabel && trimmedLabel.length > 0 ? trimmedLabel : 'Edge Function'

    return {
      code: data.code,
      functionName,
      label,
    }
  })

export const deployEdgeFunctionOutputSchema = z
  .object({ success: z.boolean().optional() })
  .passthrough()

export const rateMessageResponseSchema = z.object({
  category: z.enum([
    'sql_generation',
    'schema_design',
    'rls_policies',
    'edge_functions',
    'database_optimization',
    'debugging',
    'general_help',
    'other',
  ]),
})

export type RateMessageResponse = z.infer<typeof rateMessageResponseSchema>