"use client";

import { useMemo } from "react";
import { create } from "zustand";
import { persist } from "zustand/middleware";

import { apiGet } from "@/services/api/request";
import type { AdminPublicSettings } from "@/services/api/admin";

export type AiConfig = {
    channelMode: "remote" | "local";
    baseUrl: string;
    apiKey: string;
    model: string;
    imageModel: string;
    videoModel: string;
    textModel: string;
    videoSeconds: string;
    vquality: string;
    systemPrompt: string;
    models: string[];
    quality: string;
    size: string;
    count: string;
};

export const CONFIG_STORE_KEY = "infinite-canvas:ai_config_store";

export const defaultConfig: AiConfig = {
    channelMode: "local",
    baseUrl: "https://api.openai.com",
    apiKey: "",
    model: "gpt-image-2",
    imageModel: "gpt-image-2",
    videoModel: "grok-imagine-video",
    textModel: "gpt-5.5",
    videoSeconds: "6",
    vquality: "720",
    systemPrompt: "",
    models: [],
    quality: "auto",
    size: "1:1",
    count: "1",
};

type ConfigStore = {
    config: AiConfig;
    publicSettings: AdminPublicSettings | null;
    isPublicSettingsLoading: boolean;
    isConfigOpen: boolean;
    shouldPromptContinue: boolean;
    updateConfig: <K extends keyof AiConfig>(key: K, value: AiConfig[K]) => void;
    loadPublicSettings: () => Promise<void>;
    isAiConfigReady: (config: AiConfig, model: string) => boolean;
    openConfigDialog: (shouldPromptContinue?: boolean) => void;
    setConfigDialogOpen: (isOpen: boolean) => void;
    clearPromptContinue: () => void;
};

function resolveEffectiveConfig(config: AiConfig, modelChannel: AdminPublicSettings["modelChannel"] | null) {
    const channelMode = modelChannel?.allowCustomChannel ? config.channelMode : "remote";
    if (channelMode === "local" || !modelChannel) return { ...config, channelMode };
    const models = modelChannel.availableModels;
    const fallbackModel = modelChannel.defaultModel || models[0] || "";
    return {
        ...config,
        channelMode,
        models,
        model: models.includes(config.model) ? config.model : fallbackModel,
        imageModel: models.includes(config.imageModel) ? config.imageModel : modelChannel.defaultImageModel || fallbackModel,
        videoModel: models.includes(config.videoModel) ? config.videoModel : modelChannel.defaultVideoModel || fallbackModel,
        textModel: models.includes(config.textModel) ? config.textModel : modelChannel.defaultTextModel || fallbackModel,
        systemPrompt: modelChannel.systemPrompt,
    };
}

function isAiConfigReady(config: AiConfig, model: string) {
    return Boolean(model.trim()) && (config.channelMode === "remote" || Boolean(config.baseUrl.trim() && config.apiKey.trim()));
}

export const useConfigStore = create<ConfigStore>()(
    persist(
        (set, get) => ({
            config: defaultConfig,
            publicSettings: null,
            isPublicSettingsLoading: false,
            isConfigOpen: false,
            shouldPromptContinue: false,
            updateConfig: (key, value) =>
                set((state) => ({
                    config: {
                        ...state.config,
                        [key]: value,
                    },
                })),
            loadPublicSettings: async () => {
                if (get().isPublicSettingsLoading) return;
                set({ isPublicSettingsLoading: true });
                try {
                    set({ publicSettings: await apiGet<AdminPublicSettings>("/api/settings") });
                } finally {
                    set({ isPublicSettingsLoading: false });
                }
            },
            isAiConfigReady: (config, model) => isAiConfigReady(config, model),
            openConfigDialog: (shouldPromptContinue = false) => set({ isConfigOpen: true, shouldPromptContinue }),
            setConfigDialogOpen: (isConfigOpen) => set({ isConfigOpen }),
            clearPromptContinue: () => set({ shouldPromptContinue: false }),
        }),
        {
            name: CONFIG_STORE_KEY,
            partialize: (state) => ({ config: state.config }),
            merge: (persisted, current) => {
                const config = { ...defaultConfig, ...((persisted as Partial<ConfigStore>).config || {}) };
                return { ...current, config: { ...config, channelMode: config.channelMode || "remote", imageModel: config.imageModel || config.model, videoModel: config.videoModel || "grok-imagine-video", textModel: config.textModel || config.model, videoSeconds: config.videoSeconds || "6", vquality: config.vquality || "720" } };
            },
        },
    ),
);

export function useEffectiveConfig() {
    const config = useConfigStore((state) => state.config);
    const modelChannel = useConfigStore((state) => state.publicSettings?.modelChannel || null);
    return useMemo(() => resolveEffectiveConfig(config, modelChannel), [config, modelChannel]);
}

export function buildApiUrl(baseUrl: string, path: string) {
    let normalizedBaseUrl = baseUrl.trim().replace(/\/+$/, "");
    normalizedBaseUrl = normalizeArkPlanBaseUrl(normalizedBaseUrl);
    const lowerBaseUrl = normalizedBaseUrl.toLowerCase();
    const apiBaseUrl = lowerBaseUrl.endsWith("/v1") || lowerBaseUrl.endsWith("/api/v3") || lowerBaseUrl.endsWith("/api/plan/v3") ? normalizedBaseUrl : `${normalizedBaseUrl}/v1`;
    return `${apiBaseUrl}${path}`;
}

function normalizeArkPlanBaseUrl(baseUrl: string) {
    try {
        const url = new URL(baseUrl);
        const path = url.pathname.replace(/\/+$/, "");
        const lowerPath = path.toLowerCase();
        const arkPlanIndex = lowerPath.indexOf("/api/plan/v3");
        if (arkPlanIndex < 0) return baseUrl;
        const end = arkPlanIndex + "/api/plan/v3".length;
        if (lowerPath.length !== end && lowerPath[end] !== "/") return baseUrl;
        url.pathname = path.slice(0, end);
        url.search = "";
        url.hash = "";
        return url.toString().replace(/\/+$/, "");
    } catch {
        return baseUrl;
    }
}