import ChatService
import ChatTab
import Combine
import ComposableArchitecture
import ConversationServiceProvider
import GitHubCopilotService
import SharedUIComponents
import SwiftUI

struct ProgressAgentRound: View {
    let rounds: [AgentRound]
    let chat: StoreOf<Chat>
    var isStreaming: Bool = false

    var body: some View {
        WithPerceptionTracking {
            VStack(alignment: .leading, spacing: 8) {
                ForEach(Array(rounds.enumerated()), id: \.element.roundId) { roundIndex, round in
                    let isLastRound = roundIndex == rounds.count - 1
                    VStack(alignment: .leading, spacing: 8) {
                        ForEach(Array(round.thinking.enumerated()), id: \.offset) { entryIndex, entry in
                            ThinkingView(
                                thinking: entry,
                                isStreaming: isStreaming
                                    && isLastRound
                                    && entryIndex == round.thinking.count - 1
                            )
                        }
                        if !round.reply.isEmpty {
                            ThemedMarkdownText(text: round.reply, chat: chat)
                        }
                        if let toolCalls = round.toolCalls, !toolCalls.isEmpty {
                            ProgressToolCalls(tools: toolCalls, chat: chat)
                        }
                        if let subAgentRounds = round.subAgentRounds, !subAgentRounds.isEmpty {
                            SubAgentRounds(rounds: subAgentRounds, chat: chat)
                        }
                    }
                }
            }
            .foregroundStyle(.secondary)
        }
    }
}

struct SubAgentRounds: View {
    let rounds: [AgentRound]
    let chat: StoreOf<Chat>

    @Environment(\.colorScheme) var colorScheme

    var body: some View {
        WithPerceptionTracking {
            VStack(alignment: .leading, spacing: 8) {
                ForEach(rounds, id: \.roundId) { round in
                    VStack(alignment: .leading, spacing: 8) {
                        ForEach(Array(round.thinking.enumerated()), id: \.offset) { _, entry in
                            ThinkingView(thinking: entry, isStreaming: false)
                        }
                        if !round.reply.isEmpty {
                            ThemedMarkdownText(text: round.reply, chat: chat)
                        }
                        if let toolCalls = round.toolCalls, !toolCalls.isEmpty {
                            ProgressToolCalls(tools: toolCalls, chat: chat)
                        }
                    }
                }
            }
            .frame(maxWidth: .infinity, alignment: .leading)
            .scaledPadding(.horizontal, 16)
            .scaledPadding(.vertical, 12)
            .background(RoundedRectangle(cornerRadius: 8).fill(Color("SubagentTurnBackground")))
        }
    }
}

struct ProgressToolCalls: View {
    let tools: [AgentToolCall]
    let chat: StoreOf<Chat>

    var body: some View {
        WithPerceptionTracking {
            VStack(alignment: .leading, spacing: 4) {
                ForEach(tools) { tool in
                    if tool.name == ToolName.runInTerminal.rawValue && (tool.invokeParams != nil || tool.input != nil) {
                        RunInTerminalToolView(tool: tool, chat: chat)
                    } else if tool.invokeParams != nil && tool.status == .waitForConfirmation {
                        ToolConfirmationView(tool: tool, chat: chat)
                    } else if tool.isToolcallingLoopContinueTool {
                        // ignore rendering for internal tool calling loop continue tool
                    } else {
                        ToolStatusItemView(tool: tool)
                    }
                }
            }
        }
    }
}

struct ToolConfirmationView: View {
    let tool: AgentToolCall
    let chat: StoreOf<Chat>

    @AppStorage(\.chatFontSize) var chatFontSize

    private var toolName: String { tool.name }
    private var titleText: String { tool.title ?? "" }
    private var mcpServerName: String? { ToolAutoApprovalManager.extractMCPServerName(from: titleText) }
    private var conversationId: String { tool.invokeParams?.conversationId ?? "" }
    private var invokeMessage: String { tool.invokeParams?.message ?? "" }
    private var isSensitiveFileOperation: Bool { ToolAutoApprovalManager.isSensitiveFileOperation(message: invokeMessage) }
    private var sensitiveFileInfo: ToolAutoApprovalManager.SensitiveFileConfirmationInfo {
        ToolAutoApprovalManager.extractSensitiveFileConfirmationInfo(from: invokeMessage)
    }

    private var shouldShowMCPSplitButton: Bool { mcpServerName != nil && !conversationId.isEmpty }
    private var shouldShowSensitiveFileSplitButton: Bool {
        mcpServerName == nil && isSensitiveFileOperation && !conversationId.isEmpty
    }

    @ViewBuilder
    private var confirmationActionView: some View {
        if FeatureFlagNotifierImpl.shared.featureFlags.agentModeAutoApproval &&
           CopilotPolicyNotifierImpl.shared.copilotPolicy.agentModeAutoApprovalEnabled {
            if tool.isToolcallingLoopContinueTool {
                continueButton
            } else if shouldShowSensitiveFileSplitButton {
                sensitiveFileSplitButton
            } else if shouldShowMCPSplitButton, let serverName = mcpServerName {
                mcpSplitButton(serverName: serverName)
            } else {
                allowButton
            }
        } else {
            legacyAllowOrContinueButton
        }
    }

    private var continueButton: some View {
        Button(action: {
            chat.send(.toolCallAccepted(tool.id))
        }) {
            Text("Continue")
                .scaledFont(.body)
        }
        .buttonStyle(.borderedProminent)
    }

    private var allowButton: some View {
        Button(action: {
            chat.send(.toolCallAccepted(tool.id))
        }) {
            Text("Allow")
                .scaledFont(.body)
        }
        .buttonStyle(.borderedProminent)
    }

    private var legacyAllowOrContinueButton: some View {
        Button(action: {
            chat.send(.toolCallAccepted(tool.id))
        }) {
            Text(tool.isToolcallingLoopContinueTool ? "Continue" : "Allow")
                .scaledFont(.body)
        }
        .buttonStyle(.borderedProminent)
    }

    private var sensitiveFileMenuItems: [SplitButtonMenuItem] {
        var items: [SplitButtonMenuItem] = []

        items.append(
            SplitButtonMenuItem(title: "Allow in this Session") {
                chat.send(
                    .toolCallAcceptedWithApproval(
                        tool.id,
                        .sensitiveFile(
                            scope: .session(conversationId),
                            toolName: toolName,
                            description: sensitiveFileInfo.description,
                            pattern: sensitiveFileInfo.pattern
                        )
                    )
                )
            }
        )

        let defaultPatterns = ["**/.github/instructions/*", "**/github-copilot/**/*", "outside-workspace"]

        if let pattern = sensitiveFileInfo.pattern, !pattern.isEmpty, !defaultPatterns.contains(pattern) {
            items.append(
                SplitButtonMenuItem(title: "Always Allow") {
                    chat.send(
                        .toolCallAcceptedWithApproval(
                            tool.id,
                            .sensitiveFile(
                                scope: .global,
                                toolName: toolName,
                                description: sensitiveFileInfo.description,
                                pattern: pattern
                            )
                        )
                    )
                }
            )
        }

        items.append(.divider())
        items.append(
            SplitButtonMenuItem(title: "Configure Auto Approve...") {
                chat.send(.openAutoApproveSettings)
            }
        )

        return items
    }

    private var sensitiveFileSplitButton: some View {
        SplitButton(
            title: "Allow",
            isDisabled: false,
            primaryAction: {
                chat.send(.toolCallAccepted(tool.id))
            },
            menuItems: sensitiveFileMenuItems,
            style: .prominent
        )
    }

    private func mcpMenuItems(serverName: String) -> [SplitButtonMenuItem] {
        var items: [SplitButtonMenuItem] = []

        items.append(
            SplitButtonMenuItem(title: "Allow \(toolName) in this Session") {
                chat.send(
                    .toolCallAcceptedWithApproval(
                        tool.id,
                        .mcpTool(
                            scope: .session(conversationId),
                            serverName: serverName,
                            toolName: toolName
                        )
                    )
                )
            }
        )

        items.append(
            SplitButtonMenuItem(title: "Always Allow \(toolName)") {
                chat.send(
                    .toolCallAcceptedWithApproval(
                        tool.id,
                        .mcpTool(
                            scope: .global,
                            serverName: serverName,
                            toolName: toolName
                        )
                    )
                )
            }
        )

        items.append(.divider())

        items.append(
            SplitButtonMenuItem(title: "Allow tools from \(serverName) in this Session") {
                chat.send(
                    .toolCallAcceptedWithApproval(
                        tool.id,
                        .mcpServer(
                            scope: .session(conversationId),
                            serverName: serverName
                        )
                    )
                )
            }
        )

        items.append(
            SplitButtonMenuItem(title: "Always Allow tools from \(serverName)") {
                chat.send(
                    .toolCallAcceptedWithApproval(
                        tool.id,
                        .mcpServer(
                            scope: .global,
                            serverName: serverName
                        )
                    )
                )
            }
        )

        items.append(.divider())

        items.append(
            SplitButtonMenuItem(title: "Configure Auto Approve...") {
                chat.send(.openAutoApproveSettings)
            }
        )

        return items
    }

    private func mcpSplitButton(serverName: String) -> some View {
        SplitButton(
            title: "Allow",
            isDisabled: false,
            primaryAction: {
                chat.send(.toolCallAccepted(tool.id))
            },
            menuItems: mcpMenuItems(serverName: serverName),
            style: .prominent
        )
    }

    var body: some View {
        WithPerceptionTracking {
            VStack(alignment: .leading, spacing: 8) {
                if let title = tool.title {
                    ToolConfirmationTitleView(title: title, fontWeight: .semibold)
                } else {
                    GenericToolTitleView(toolStatus: "Run", toolName: tool.name, fontWeight: .semibold)
                }

                ThemedMarkdownText(text: tool.invokeParams?.message ?? "", chat: chat)
                    .frame(maxWidth: .infinity, alignment: .leading)

                HStack {
                    Button(action: {
                        chat.send(.toolCallCancelled(tool.id))
                    }) {
                        Text(tool.isToolcallingLoopContinueTool ? "Cancel" : "Skip")
                            .scaledFont(.body)
                    }

                    confirmationActionView
                }
                .frame(maxWidth: .infinity, alignment: .leading)
                .scaledPadding(.top, 4)
            }
            .scaledPadding(8)
            .cornerRadius(8)
            .overlay(
                RoundedRectangle(cornerRadius: 8)
                    .stroke(Color.gray.opacity(0.2), lineWidth: 1)
            )
        }
    }
}

struct ToolConfirmationTitleView: View {
    var title: String
    var fontWeight: Font.Weight = .regular

    @AppStorage(\.chatFontSize) var chatFontSize

    var body: some View {
        HStack(spacing: 4) {
            Text(title)
                .textSelection(.enabled)
                .scaledFont(size: chatFontSize, weight: fontWeight)
                .foregroundStyle(.primary)
                .background(Color.clear)
        }
        .frame(maxWidth: .infinity, alignment: .leading)
    }
}

struct GenericToolTitleView: View {
    var toolStatus: String
    var toolName: String
    var fontWeight: Font.Weight = .regular

    @AppStorage(\.chatFontSize) var chatFontSize

    var body: some View {
        HStack(spacing: 4) {
            Text(toolStatus)
                .textSelection(.enabled)
                .scaledFont(size: chatFontSize - 1, weight: fontWeight)
                .foregroundStyle(.primary)
                .background(Color.clear)
            Text(toolName)
                .textSelection(.enabled)
                .scaledFont(size: chatFontSize - 1, weight: fontWeight)
                .foregroundStyle(.primary)
                .scaledPadding(.vertical, 2)
                .scaledPadding(.horizontal, 4)
                .background(Color("ToolTitleHighlightBgColor"))
                .cornerRadius(4)
                .overlay(
                    RoundedRectangle(cornerRadius: 4)
                        .inset(by: 0.5)
                        .stroke(Color(nsColor: .separatorColor), lineWidth: 1)
                )
        }
        .frame(maxWidth: .infinity, alignment: .leading)
    }
}

struct ProgressAgentRound_Preview: PreviewProvider {
    static let agentRounds: [AgentRound] = [
        .init(roundId: 1, reply: "this is agent step", toolCalls: [
            // Completed read file
            .init(
                id: "toolcall_001",
                name: ServerToolName.readFile.rawValue,
                progressMessage: "Read src/AppDelegate.swift",
                status: .completed),
            // Completed file search with results
            .init(
                id: "toolcall_002",
                name: ServerToolName.findFiles.rawValue,
                progressMessage: "Searched for files matching query: **/*.swift",
                status: .completed,
                resultDetails: [
                    .fileLocation(.init(uri: "file:///src/App.swift", range: .init(start: .init(line: 0, character: 0), end: .init(line: 10, character: 0)))),
                    .fileLocation(.init(uri: "file:///src/Model.swift", range: .init(start: .init(line: 0, character: 0), end: .init(line: 5, character: 0)))),
                    .fileLocation(.init(uri: "file:///src/ViewModel.swift", range: .init(start: .init(line: 0, character: 0), end: .init(line: 8, character: 0)))),
                ]),
            // Completed create file (expandable)
            .init(
                id: "toolcall_003",
                name: ToolName.createFile.rawValue,
                progressMessage: "Created src/NewFeature.swift",
                status: .completed,
                result: [.text("```swift\nstruct NewFeature {\n    var name: String\n}\n```")]),
            // Completed replace string (expandable)
            .init(
                id: "toolcall_004",
                name: ServerToolName.replaceString.rawValue,
                progressMessage: "Edited src/Config.swift",
                status: .completed,
                result: [.text("```diff\n- let version = \"1.0\"\n+ let version = \"2.0\"\n```")]),
            // Running tool
            .init(
                id: "toolcall_005",
                name: ServerToolName.codebase.rawValue,
                progressMessage: "Searching codebase for references",
                status: .running),
            // Error tool
            .init(
                id: "toolcall_006",
                name: ServerToolName.readFile.rawValue,
                progressMessage: "Read missing_file.swift",
                status: .error,
                error: "File not found"),
        ]),
    ]

    static var previews: some View {
        let chatTabInfo = ChatTabInfo(id: "id", workspacePath: "path", username: "name")
        ProgressAgentRound(rounds: agentRounds, chat: .init(initialState: .init(), reducer: { Chat(service: ChatService.service(for: chatTabInfo)) }))
            .frame(width: 400, height: 500)
    }
}