import { cloneDeep } from "lodash/fp"
import { get } from "svelte/store"
import { findComponent, findComponentPath } from "./storeUtils"
import { store } from "builderStore"
import {
  tables as tablesStore,
  queries as queriesStores,
} from "stores/backend/"
import { makePropSafe } from "@budibase/string-templates"
import { TableNames } from "../constants"

// Regex to match all instances of template strings
const CAPTURE_VAR_INSIDE_TEMPLATE = /{{([^}]+)}}/g
const CAPTURE_HBS_TEMPLATE = /{{[\S\s]*?}}/g

/**
 * Gets all bindable data context fields and instance fields.
 */
export const getBindableProperties = (asset, componentId) => {
  const contextBindings = getContextBindings(asset, componentId)
  const userBindings = getUserBindings()
  const urlBindings = getUrlBindings(asset, componentId)
  return [...contextBindings, ...userBindings, ...urlBindings]
}

/**
 * Gets all data provider components above a component.
 */
export const getDataProviderComponents = (asset, componentId) => {
  if (!asset || !componentId) {
    return []
  }

  // Get the component tree leading up to this component, ignoring the component
  // itself
  const path = findComponentPath(asset.props, componentId)
  path.pop()

  // Filter by only data provider components
  return path.filter(component => {
    const def = store.actions.components.getDefinition(component._component)
    return def?.context != null
  })
}

/**
 * Gets all data provider components above a component.
 */
export const getActionProviderComponents = (asset, componentId, actionType) => {
  if (!asset || !componentId) {
    return []
  }

  // Get the component tree leading up to this component, ignoring the component
  // itself
  const path = findComponentPath(asset.props, componentId)
  path.pop()

  // Filter by only data provider components
  return path.filter(component => {
    const def = store.actions.components.getDefinition(component._component)
    return def?.actions?.includes(actionType)
  })
}

/**
 * Gets a datasource object for a certain data provider component
 */
export const getDatasourceForProvider = (asset, component) => {
  const def = store.actions.components.getDefinition(component?._component)
  if (!def) {
    return null
  }

  // If this component has a dataProvider setting, go up the stack and use it
  const dataProviderSetting = def.settings.find(setting => {
    return setting.type === "dataProvider"
  })
  if (dataProviderSetting) {
    const settingValue = component[dataProviderSetting.key]
    const providerId = extractLiteralHandlebarsID(settingValue)
    const provider = findComponent(asset.props, providerId)
    return getDatasourceForProvider(asset, provider)
  }

  // Extract datasource from component instance
  const validSettingTypes = ["dataSource", "table", "schema"]
  const datasourceSetting = def.settings.find(setting => {
    return validSettingTypes.includes(setting.type)
  })
  if (!datasourceSetting) {
    return null
  }

  // There are different types of setting which can be a datasource, for
  // example an actual datasource object, or a table ID string.
  // Convert the datasource setting into a proper datasource object so that
  // we can use it properly
  if (datasourceSetting.type === "table") {
    return {
      tableId: component[datasourceSetting?.key],
      type: "table",
    }
  } else {
    return component[datasourceSetting?.key]
  }
}

/**
 * Gets all bindable data properties from component data contexts.
 */
const getContextBindings = (asset, componentId) => {
  // Extract any components which provide data contexts
  const dataProviders = getDataProviderComponents(asset, componentId)
  let bindings = []

  // Create bindings for each data provider
  dataProviders.forEach(component => {
    const def = store.actions.components.getDefinition(component._component)
    const contextDefinition = def.context
    let schema
    let readablePrefix

    if (contextDefinition.type === "form") {
      // Forms do not need table schemas
      // Their schemas are built from their component field names
      schema = buildFormSchema(component)
      readablePrefix = "Fields"
    } else if (contextDefinition.type === "static") {
      // Static contexts are fully defined by the components
      schema = {}
      const values = contextDefinition.values || []
      values.forEach(value => {
        schema[value.key] = { name: value.label, type: "string" }
      })
    } else if (contextDefinition.type === "schema") {
      // Schema contexts are generated dynamically depending on their data
      const datasource = getDatasourceForProvider(asset, component)
      if (!datasource) {
        return
      }
      const info = getSchemaForDatasource(datasource)
      schema = info.schema
      readablePrefix = info.table?.name
    }
    if (!schema) {
      return
    }

    const keys = Object.keys(schema).sort()

    // Create bindable properties for each schema field
    const safeComponentId = makePropSafe(component._id)
    keys.forEach(key => {
      const fieldSchema = schema[key]

      // Make safe runtime binding and replace certain bindings with a
      // new property to help display components
      let runtimeBoundKey = key
      if (fieldSchema.type === "link") {
        runtimeBoundKey = `${key}_text`
      } else if (fieldSchema.type === "attachment") {
        runtimeBoundKey = `${key}_first`
      }
      const runtimeBinding = `${safeComponentId}.${makePropSafe(
        runtimeBoundKey
      )}`

      // Optionally use a prefix with readable bindings
      let readableBinding = component._instanceName
      if (readablePrefix) {
        readableBinding += `.${readablePrefix}`
      }
      readableBinding += `.${fieldSchema.name || key}`

      // Create the binding object
      bindings.push({
        type: "context",
        runtimeBinding,
        readableBinding,
        // Field schema and provider are required to construct relationship
        // datasource options, based on bindable properties
        fieldSchema,
        providerId: component._id,
      })
    })
  })

  return bindings
}

/**
 * Gets all bindable properties from the logged in user.
 */
const getUserBindings = () => {
  let bindings = []
  const { schema } = getSchemaForDatasource({
    type: "table",
    tableId: TableNames.USERS,
  })
  const keys = Object.keys(schema).sort()
  const safeUser = makePropSafe("user")
  keys.forEach(key => {
    const fieldSchema = schema[key]
    // Replace certain bindings with a new property to help display components
    let runtimeBoundKey = key
    if (fieldSchema.type === "link") {
      runtimeBoundKey = `${key}_text`
    } else if (fieldSchema.type === "attachment") {
      runtimeBoundKey = `${key}_first`
    }

    bindings.push({
      type: "context",
      runtimeBinding: `${safeUser}.${makePropSafe(runtimeBoundKey)}`,
      readableBinding: `Current User.${key}`,
      // Field schema and provider are required to construct relationship
      // datasource options, based on bindable properties
      fieldSchema,
      providerId: "user",
    })
  })

  return bindings
}

/**
 * Gets all bindable properties from URL parameters.
 */
const getUrlBindings = asset => {
  const url = asset?.routing?.route ?? ""
  const split = url.split("/")
  let params = []
  split.forEach(part => {
    if (part.startsWith(":") && part.length > 1) {
      params.push(part.replace(/:/g, "").replace(/\?/g, ""))
    }
  })
  const safeURL = makePropSafe("url")
  return params.map(param => ({
    type: "context",
    runtimeBinding: `${safeURL}.${makePropSafe(param)}`,
    readableBinding: `URL.${param}`,
  }))
}

/**
 * Gets a schema for a datasource object.
 */
export const getSchemaForDatasource = (datasource, isForm = false) => {
  let schema, table
  if (datasource) {
    const { type } = datasource
    if (type === "query") {
      const queries = get(queriesStores).queries
      table = queries.find(query => query._id === datasource._id)
    } else {
      const tables = get(tablesStore).list
      table = tables.find(table => table._id === datasource.tableId)
    }
    if (table) {
      if (type === "view") {
        schema = cloneDeep(table.views?.[datasource.name]?.schema)
      } else if (type === "query" && isForm) {
        schema = {}
        const params = table.parameters || []
        params.forEach(param => {
          if (param?.name) {
            schema[param.name] = { ...param, type: "string" }
          }
        })
      } else {
        schema = cloneDeep(table.schema)
      }
    }

    // Add _id and _rev fields for certain types
    if (schema && !isForm && ["table", "link"].includes(datasource.type)) {
      schema["_id"] = { type: "string" }
      schema["_rev"] = { type: "string" }
    }

    // Ensure there are "name" properties for all fields
    if (schema) {
      Object.keys(schema).forEach(field => {
        if (!schema[field].name) {
          schema[field].name = field
        }
      })
    }
  }
  return { schema, table }
}

/**
 * Builds a form schema given a form component.
 * A form schema is a schema of all the fields nested anywhere within a form.
 */
const buildFormSchema = component => {
  let schema = {}
  if (!component) {
    return schema
  }
  const def = store.actions.components.getDefinition(component._component)
  const fieldSetting = def?.settings?.find(
    setting => setting.key === "field" && setting.type.startsWith("field/")
  )
  if (fieldSetting && component.field) {
    const type = fieldSetting.type.split("field/")[1]
    if (type) {
      schema[component.field] = { type }
    }
  }
  component._children?.forEach(child => {
    const childSchema = buildFormSchema(child)
    schema = { ...schema, ...childSchema }
  })
  return schema
}

/**
 * Recurses the input object to remove any instances of bindings.
 */
export function removeBindings(obj) {
  for (let [key, value] of Object.entries(obj)) {
    if (typeof value === "object") {
      obj[key] = removeBindings(value)
    } else if (typeof value === "string") {
      obj[key] = value.replace(CAPTURE_HBS_TEMPLATE, "Invalid binding")
    }
  }
  return obj
}

/**
 * utility function for the readableToRuntimeBinding and runtimeToReadableBinding.
 */
function bindingReplacement(bindableProperties, textWithBindings, convertTo) {
  const convertFrom =
    convertTo === "runtimeBinding" ? "readableBinding" : "runtimeBinding"
  if (typeof textWithBindings !== "string") {
    return textWithBindings
  }
  const convertFromProps = bindableProperties
    .map(el => el[convertFrom])
    .sort((a, b) => {
      return b.length - a.length
    })
  const boundValues = textWithBindings.match(CAPTURE_VAR_INSIDE_TEMPLATE) || []
  let result = textWithBindings
  for (let boundValue of boundValues) {
    let newBoundValue = boundValue
    for (let from of convertFromProps) {
      if (newBoundValue.includes(from)) {
        const binding = bindableProperties.find(el => el[convertFrom] === from)
        newBoundValue = newBoundValue.replace(from, binding[convertTo])
      }
    }
    result = result.replace(boundValue, newBoundValue)
  }
  return result
}

/**
 * Extracts a component ID from a handlebars expression setting of
 * {{ literal [componentId] }}
 */
function extractLiteralHandlebarsID(value) {
  return value?.match(/{{\s*literal[\s[]+([a-fA-F0-9]+)[\s\]]*}}/)?.[1]
}

/**
 * Converts a readable data binding into a runtime data binding
 */
export function readableToRuntimeBinding(bindableProperties, textWithBindings) {
  return bindingReplacement(
    bindableProperties,
    textWithBindings,
    "runtimeBinding"
  )
}

/**
 * Converts a runtime data binding into a readable data binding
 */
export function runtimeToReadableBinding(bindableProperties, textWithBindings) {
  return bindingReplacement(
    bindableProperties,
    textWithBindings,
    "readableBinding"
  )
}