import ASTParser
import ChatContextCollector
import Dependencies
import FocusedCodeFinder
import Foundation
import GitIgnoreCheck
import OpenAIService
import Preferences
import SuggestionModel
import XcodeInspector

public final class ActiveDocumentChatContextCollector: ChatContextCollector {
    public init() {}

    public var activeDocumentContext: ActiveDocumentContext?

    @Dependency(\.gitIgnoredChecker) var gitIgnoredChecker

    public func generateContext(
        history: [ChatMessage],
        scopes: Set<ChatContext.Scope>,
        content: String,
        configuration: ChatGPTConfiguration
    ) async -> ChatContext {
        guard let info = getEditorInformation() else { return .empty }
        let context = getActiveDocumentContext(info)
        activeDocumentContext = context

        let isSensitive = await gitIgnoredChecker.checkIfGitIgnored(fileURL: info.documentURL)

        guard scopes.contains(.code)
        else {
            if scopes.contains(.file) {
                var removedCode = context
                removedCode.focusedContext = nil
                return .init(
                    systemPrompt: extractSystemPrompt(removedCode, isSensitive: isSensitive),
                    retrievedContent: [],
                    functions: []
                )
            }
            return .empty
        }

        var functions = [any ChatGPTFunction]()

        if !isSensitive {
            // When the bot is not focusing on any code, or the focusing area is not the user's
            // selection, it can move the focus back to the user's selection.

            if context.focusedContext == nil ||
                !(context.focusedContext?.codeRange.contains(context.selectionRange) ?? false)
            {
                functions.append(MoveToFocusedCodeFunction(contextCollector: self))
            }

            // When there is a line annotation not in the focused area, the bot can move the focus
            // area
            // to the code covering the line of the annotation.

            if let focusedContext = context.focusedContext,
               !focusedContext.otherLineAnnotations.isEmpty
            {
                functions.append(MoveToCodeAroundLineFunction(contextCollector: self))
            }

            if context.focusedContext == nil, !context.lineAnnotations.isEmpty {
                functions.append(MoveToCodeAroundLineFunction(contextCollector: self))
            }
        }

        return .init(
            systemPrompt: extractSystemPrompt(context, isSensitive: isSensitive),
            retrievedContent: [],
            functions: functions
        )
    }

    func getActiveDocumentContext(_ info: EditorInformation) -> ActiveDocumentContext {
        var activeDocumentContext = activeDocumentContext ?? .init(
            documentURL: .init(fileURLWithPath: "/"),
            relativePath: "",
            language: .builtIn(.swift),
            fileContent: "",
            lines: [],
            selectedCode: "",
            selectionRange: .outOfScope,
            lineAnnotations: [],
            imports: [],
            includes: []
        )

        activeDocumentContext.update(info)
        return activeDocumentContext
    }

    func extractSystemPrompt(_ context: ActiveDocumentContext, isSensitive: Bool) -> String {
        let start = """
        ## File and Code Scope

        You can use the following context to answer my questions about the editing document \
        or code. The context shows only a part of the code in the editing document, and will \
        change during the conversation, so it may not match our conversation.

        \(
            context.focusedContext == nil
                ? ""
                : "When you don't known what I am asking, I am probably referring to the code."
        )

        ### Editing Document Context
        """
        let relativePath = "Document Relative Path: \(context.relativePath)"
        let language = "Language: \(context.language.rawValue)"

        if let focusedContext = context.focusedContext {
            let codeContext = focusedContext.context.isEmpty || isSensitive
                ? ""
                : """
                Focused Context:
                ```
                \(focusedContext.context.map(\.signature).joined(separator: "\n"))
                ```
                """

            let codeRange = "Focused Range [line, character]: \(focusedContext.codeRange)"

            let code = context.selectionRange.isEmpty && isSensitive
                ? """
                The file is in gitignore, you can't read the file.
                Ask the user to select the code in the editor to get help. Also tell them the file is in gitignore.
                """
                : """
                Focused Code (start from line \(focusedContext.codeRange.start.line + 1)):
                ```\(context.language.rawValue)
                \(focusedContext.code)
                ```
                """

            let fileAnnotations = focusedContext.otherLineAnnotations.isEmpty || isSensitive
                ? ""
                : """
                Other Annotations:\"""
                (They are not inside the focused code. You don't known how to handle them until you get the code at the line)
                \(
                    focusedContext.otherLineAnnotations
                        .map(convertAnnotationToText)
                        .joined(separator: "\n")
                )
                \"""
                """

            let codeAnnotations = focusedContext.lineAnnotations.isEmpty || isSensitive
                ? ""
                : """
                Annotations Inside Focused Range:\"""
                \(
                    focusedContext.lineAnnotations
                        .map(convertAnnotationToText)
                        .joined(separator: "\n")
                )
                \"""
                """

            return [
                start,
                relativePath,
                language,
                codeContext,
                codeRange,
                code,
                codeAnnotations,
                fileAnnotations,
            ]
            .filter { !$0.isEmpty }
            .joined(separator: "\n\n")
        } else {
            let selectionRange = "Selection Range [line, character]: \(context.selectionRange)"
            let lineAnnotations = context.lineAnnotations.isEmpty || isSensitive
                ? ""
                : """
                Line Annotations:\"""
                \(context.lineAnnotations.map(convertAnnotationToText).joined(separator: "\n"))
                \"""
                """

            return [
                start,
                relativePath,
                language,
                lineAnnotations,
                selectionRange,
            ]
            .filter { !$0.isEmpty }
            .joined(separator: "\n\n")
        }
    }

    func convertAnnotationToText(_ annotation: EditorInformation.LineAnnotation) -> String {
        return "- Line \(annotation.line), \(annotation.type): \(annotation.message)"
    }
}