import type { Schema } from '$lib/common'
import {
	JobService,
	ScriptService,
	type Flow,
	type FlowModule,
	type InputTransform,
	type Job
} from '$lib/gen'
import { inferArgs } from '$lib/infer'
import { loadSchema, loadSchemaFlow } from '$lib/scripts'
import { workspaceStore } from '$lib/stores'
import { emptySchema } from '$lib/utils'
import { get } from 'svelte/store'
import type { FlowModuleState } from './flowState'
import type { PickableProperties } from './previousResults'
import { NEVER_TESTED_THIS_FAR } from './models'
import { sendUserToast } from '$lib/toast'

function create_context_function_template(eval_string: string, context: Record<string, any>) {
	return `
return function (context) {
"use strict";
${
	Object.keys(context).length > 0
		? `let ${Object.keys(context).map((key) => ` ${key} = context['${key}']`)};`
		: ``
}
return ${eval_string}
}`
}

function make_context_evaluator(eval_string, context): (context) => any {
	let template = create_context_function_template(eval_string, context)
	let functor = Function(template)
	return functor()
}

export function evalValue(
	k: string,
	mod: FlowModule,
	testStepStore: Record<string, any>,
	pickableProperties: PickableProperties | undefined,
	showError: boolean
) {
	let inputTransforms = (mod.value['input_transforms'] ?? {}) as Record<string, InputTransform>
	let v = testStepStore[mod.id]?.[k]
	let t = inputTransforms?.[k]
	if (!v) {
		if (t.type == 'static') {
			v = t.value
		} else {
			try {
				let context = {
					flow_input: pickableProperties?.flow_input,
					results: pickableProperties?.priorIds
				}
				v = make_context_evaluator(t.expr, context)(context)
			} catch (e) {
				if (showError) {
					sendUserToast(`Error evaluating ${k}: ${e.message}`, true)
				}
				v = undefined
			}
		}
	}
	if (v == NEVER_TESTED_THIS_FAR) {
		return undefined
	}
	return v
}

export function cleanInputs(flow: Flow | any): Flow {
	const newFlow: Flow = JSON.parse(JSON.stringify(flow))
	newFlow.value.modules.forEach((mod) => {
		if (mod.value.type == 'rawscript' || mod.value.type == 'script') {
			Object.values(mod.value.input_transforms ?? {}).forEach((inp) => {
				// for now we use the value for dynamic expression when done in the static editor so we have to resort to this
				if (inp.type == 'javascript') {
					//@ts-ignore
					inp.value = undefined
					inp.expr = cleanExpr(inp.expr)
				} else {
					//@ts-ignore
					inp.expr = undefined
				}
			})
		}
	})

	return newFlow
}

export function cleanExpr(expr: string): string {
	return expr
		.split('\n')
		.filter((x) => x != '' && !x.startsWith(`import `))
		.join('\n')
}

export async function loadSchemaFromModule(module: FlowModule): Promise<{
	input_transforms: Record<string, InputTransform>
	schema: Schema
}> {
	const mod = module.value

	if (mod.type == 'rawscript' || mod.type === 'script' || mod.type === 'flow') {
		let schema: Schema
		if (mod.type === 'rawscript') {
			schema = emptySchema()
			await inferArgs(mod.language!, mod.content ?? '', schema)
		} else if (mod.type == 'script' && mod.path && mod.path != '') {
			schema = await loadSchema(mod.path!, mod.hash)
		} else if (mod.type == 'flow' && mod.path && mod.path != '') {
			schema = await loadSchemaFlow(mod.path!)
		} else {
			return {
				input_transforms: {},
				schema: emptySchema()
			}
		}

		const keys = Object.keys(schema?.properties ?? {})

		let input_transforms = mod.input_transforms ?? {}

		if (JSON.stringify(keys.sort()) !== JSON.stringify(Object.keys(input_transforms).sort())) {
			input_transforms = keys.reduce((accu, key) => {
				let nv =
					input_transforms[key] ??
					(module.id == 'failure' && ['message', 'name'].includes(key)
						? { type: 'javascript', expr: `error.${key}` }
						: {
								type: 'static',
								value: undefined
						  })
				accu[key] = nv
				return accu
			}, {})
		}

		return {
			input_transforms: input_transforms,
			schema: schema ?? emptySchema()
		}
	}

	return {
		input_transforms: {},
		schema: emptySchema()
	}
}

const dynamicTemplateRegex = new RegExp(/\$\{(.*)\}/)

export function isCodeInjection(expr: string | undefined): boolean {
	if (!expr) {
		return false
	}

	return dynamicTemplateRegex.test(expr)
}

export function getDefaultExpr(
	key: string = 'myfield',
	previousModuleId: string | undefined,
	previousExpr?: string
) {
	return (
		previousExpr ?? (previousModuleId ? `results.${previousModuleId}.${key}` : `flow_input.${key}`)
	)
}

export function jobsToResults(jobs: Job[]) {
	return jobs.map((job) => {
		if ('result' in job) {
			return job.result
		} else if (Array.isArray(job)) {
			return jobsToResults(job)
		}
	})
}

export async function runFlowPreview(args: Record<string, any>, flow: Flow) {
	const newFlow = flow
	return await JobService.runFlowPreview({
		workspace: get(workspaceStore) ?? '',
		requestBody: {
			args,
			value: newFlow.value,
			path: newFlow.path,
			tag: newFlow.tag
		}
	})
}

export function codeToStaticTemplate(code?: string): string | undefined {
	if (!code || typeof code != 'string') return undefined

	const lines = code.split('\n')
	if (lines.length == 1) {
		const line = lines[0].trim()
		if (line[0] == '`' && line.charAt(line.length - 1) == '`') {
			return line.slice(1, line.length - 1).replaceAll('\\`', '`')
		} else {
			return `\$\{${line}\}`
		}
	}
	return undefined
}

export function emptyFlowModuleState(): FlowModuleState {
	return {
		schema: emptySchema(),
		previewResult: NEVER_TESTED_THIS_FAR
	}
}

export async function findNextAvailablePath(path: string): Promise<string> {
	try {
		await ScriptService.getScriptByPath({
			workspace: get(workspaceStore)!,
			path
		})

		const [_, version] = path.split(/.*_([0-9]*)/)

		if (version.length > 0) {
			path = path.slice(0, -(version.length + 1))
		}

		path = `${path}_${Number(version) + 1}`

		return findNextAvailablePath(path)
	} catch (e) {
		// Catching an error means the path is available
		return path
	}
}