import type { IncomingMessage, ServerResponse } from "node:http";
import { readWebuiAvatarSettings, writeWebuiAvatarSettings } from "../db/index.ts";
import { setExtensionEnabled } from "../settings/extension-settings.ts";
import { listMcpSettings, setMcpServerEnabled, setMcpToolEnabled } from "../settings/mcp-settings.ts";
import { listSkillSettings, setSkillEnabled } from "../settings/skills-settings.ts";
import { normalizeAvatarUrl } from "../services/avatars.ts";
import {
	listExtensionsForSettings,
	listLoadedExtensionsByPath,
	mergeExtensionToggleResponse,
} from "../services/extensions-display.ts";
import { readModelsConfig, writeModelsConfig } from "../services/models-config.ts";
import { readSystemPrompt, writeSystemPrompt } from "../services/system-prompt.ts";
import type { WebUiContext } from "../types/context.ts";
import { json, readBody } from "../http/request.ts";

function listMcpTools(ctx: WebUiContext): Record<string, unknown>[] {
	return listMcpSettings(ctx.config.paths.mcpConfigFile, ctx.config.paths.mcpCacheFile);
}

export function handleSettingsRoute(
	req: IncomingMessage,
	res: ServerResponse,
	ctx: WebUiContext,
	pathname: string,
): boolean {
	const { paths } = ctx.config;
	const { sendCmd } = ctx.rpc;

	if (req.method === "GET" && pathname === "/api/settings") {
		void listSkillSettings(paths.repoRoot, paths.agentDir)
			.then((skills) =>
				listExtensionsForSettings(paths, sendCmd).then((extensions) =>
					json(res, {
						...readWebuiAvatarSettings(),
						webuiDbPath: ctx.db.dbPath,
						systemPrompt: readSystemPrompt(paths),
						systemPromptPath: paths.systemPromptFile,
						modelsConfig: readModelsConfig(paths),
						modelsConfigPath: paths.modelsConfigFile,
						extensionsPath: paths.agentExtensionsDir,
						mcpCachePath: paths.mcpCacheFile,
						mcpConfigPath: paths.mcpConfigFile,
						skills,
						extensions,
						mcpTools: listMcpTools(ctx),
					}),
				),
			)
			.catch((err) => json(res, { error: err.message }, 500));
		return true;
	}

	if (req.method === "POST" && pathname === "/api/settings/skills/toggle") {
		void readBody(req)
			.then(async ({ path: skillPath, enabled }) => {
				if (typeof skillPath !== "string" || !skillPath.trim()) {
					throw new Error("skill path 无效");
				}
				if (typeof enabled !== "boolean") {
					throw new Error("enabled 必须是 boolean");
				}
				const skill = await setSkillEnabled(paths.repoRoot, paths.agentDir, skillPath.trim(), enabled);
				const reload = await sendCmd({ type: "reload" });
				if (!reload.success) throw new Error(reload.error || "Agent 重新加载失败");
				json(res, { ok: true, skill });
			})
			.catch((err) => json(res, { error: err.message }, 500));
		return true;
	}

	if (req.method === "POST" && pathname === "/api/settings/extensions/toggle") {
		void readBody(req)
			.then(async ({ path: extensionPath, enabled }) => {
				if (typeof extensionPath !== "string" || !extensionPath.trim()) {
					throw new Error("extension path 无效");
				}
				if (typeof enabled !== "boolean") {
					throw new Error("enabled 必须是 boolean");
				}
				const extension = await setExtensionEnabled(
					paths.repoRoot,
					paths.agentDir,
					extensionPath.trim(),
					enabled,
				);
				const reload = await sendCmd({ type: "reload" });
				if (!reload.success) throw new Error(reload.error || "Agent 重新加载失败");
				let loadedByPath = new Map<string, any>();
				try {
					loadedByPath = await listLoadedExtensionsByPath(paths, sendCmd);
				} catch {
					/* ignore */
				}
				json(res, {
					ok: true,
					extension: mergeExtensionToggleResponse(paths, extension, loadedByPath),
				});
			})
			.catch((err) => json(res, { error: err.message }, 500));
		return true;
	}

	if (req.method === "POST" && pathname === "/api/settings/mcp/server/toggle") {
		void readBody(req)
			.then(async ({ server, enabled }) => {
				if (typeof server !== "string" || !server.trim()) {
					throw new Error("server 名称无效");
				}
				if (typeof enabled !== "boolean") {
					throw new Error("enabled 必须是 boolean");
				}
				const entry = setMcpServerEnabled(
					paths.mcpConfigFile,
					paths.mcpCacheFile,
					server.trim(),
					enabled,
				);
				const reload = await sendCmd({ type: "reload" });
				if (!reload.success) throw new Error(reload.error || "Agent 重新加载失败");
				json(res, { ok: true, server: entry });
			})
			.catch((err) => json(res, { error: err.message }, 500));
		return true;
	}

	if (req.method === "POST" && pathname === "/api/settings/mcp/tool/toggle") {
		void readBody(req)
			.then(async ({ server, tool, enabled }) => {
				if (typeof server !== "string" || !server.trim()) {
					throw new Error("server 名称无效");
				}
				if (typeof tool !== "string" || !tool.trim()) {
					throw new Error("tool 名称无效");
				}
				if (typeof enabled !== "boolean") {
					throw new Error("enabled 必须是 boolean");
				}
				const entry = setMcpToolEnabled(
					paths.mcpConfigFile,
					paths.mcpCacheFile,
					server.trim(),
					tool.trim(),
					enabled,
				);
				const reload = await sendCmd({ type: "reload" });
				if (!reload.success) throw new Error(reload.error || "Agent 重新加载失败");
				json(res, { ok: true, tool: entry });
			})
			.catch((err) => json(res, { error: err.message }, 500));
		return true;
	}

	if (req.method === "POST" && pathname === "/api/settings/reload") {
		void sendCmd({ type: "reload" })
			.then((r: any) => (r.success ? json(res, { ok: true }) : json(res, { error: r.error }, 500)))
			.catch((err) => json(res, { error: err.message }, 500));
		return true;
	}

	if (req.method === "POST" && pathname === "/api/settings/models-config") {
		void readBody(req)
			.then(async ({ modelsConfig }) => {
				if (typeof modelsConfig !== "string") {
					throw new Error("modelsConfig 必须是字符串");
				}
				writeModelsConfig(paths, modelsConfig);
				const reload = await sendCmd({ type: "reload" });
				if (!reload.success) throw new Error(reload.error || "Agent 重新加载失败");
				json(res, { ok: true, modelsConfigPath: paths.modelsConfigFile });
			})
			.catch((err) => json(res, { error: err.message }, 500));
		return true;
	}

	if (req.method === "POST" && pathname === "/api/settings/system-prompt") {
		void readBody(req)
			.then(async ({ systemPrompt }) => {
				if (typeof systemPrompt !== "string") {
					throw new Error("systemPrompt 必须是字符串");
				}
				writeSystemPrompt(paths, systemPrompt);
				const reload = await sendCmd({ type: "reload" });
				if (!reload.success) throw new Error(reload.error || "Agent 重新加载失败");
				json(res, { ok: true, systemPromptPath: paths.systemPromptFile });
			})
			.catch((err) => json(res, { error: err.message }, 500));
		return true;
	}

	if (req.method === "POST" && pathname === "/api/settings/avatars") {
		void readBody(req)
			.then(({ userAvatarUrl, agentAvatarUrl }) => {
				const settings = {
					userAvatarUrl: normalizeAvatarUrl(userAvatarUrl),
					agentAvatarUrl: normalizeAvatarUrl(agentAvatarUrl),
				};
				writeWebuiAvatarSettings(settings);
				json(res, { ok: true, ...settings });
			})
			.catch((err) => json(res, { error: err.message }, 500));
		return true;
	}

	return false;
}