package com.jetbrains.dokka

import org.jetbrains.jet.lang.resolve.*
import org.jetbrains.jet.lang.psi.*
import org.jetbrains.jet.lang.descriptors.*
import org.jetbrains.jet.lang.descriptors.impl.*

fun BindingContext.createDocumentation(file: JetFile): DocumentationModel {
    val model = DocumentationModel()
    val packageFragment = getPackageFragment(file)
    if (packageFragment == null) throw IllegalArgumentException("File $file should have package fragment")

    val visitor = DocumentationBuilderVisitor(this)
    visitDescriptor(packageFragment, model, visitor)

    return model
}

class DocumentationBuilderVisitor(val context : BindingContext) : DeclarationDescriptorVisitorEmptyBodies<DocumentationNode, DocumentationNode>() {

    override fun visitDeclarationDescriptor(descriptor: DeclarationDescriptor?, data: DocumentationNode?): DocumentationNode? {
        val doc = context.getDocumentation(descriptor!!).extractText()
        val node = DocumentationNode(descriptor.getName().asString(), doc, DocumentationNodeKind.Unknown)
        data?.addReferenceTo(node, DocumentationReferenceKind.Member)
        return node
    }

    override fun visitValueParameterDescriptor(descriptor: ValueParameterDescriptor?, data: DocumentationNode?): DocumentationNode? {
        val doc = context.getDocumentation(descriptor!!).extractText()
        val node = DocumentationNode(descriptor.getName().asString(), doc, DocumentationNodeKind.Parameter)
        data?.addReferenceTo(node, DocumentationReferenceKind.Detail)
        return node
    }


    override fun visitFunctionDescriptor(descriptor: FunctionDescriptor?, data: DocumentationNode?): DocumentationNode? {
        val doc = context.getDocumentation(descriptor!!).extractText()
        val node = DocumentationNode(descriptor.getName().asString(), doc, DocumentationNodeKind.Function)
        data?.addReferenceTo(node, DocumentationReferenceKind.Member)
        return node
    }


    override fun visitPackageFragmentDescriptor(descriptor: PackageFragmentDescriptor?, data: DocumentationNode?): DocumentationNode? {
        val node = DocumentationNode(descriptor!!.fqName.asString(), "", DocumentationNodeKind.Package)
        data?.addReferenceTo(node, DocumentationReferenceKind.Member)
        return node
    }
}