-- 各环境专属系统数据库 (System App DB) 初始化脚本
-- 注意：对话记录、系统用户、执行任务状态等在各环境之间严格物理/逻辑隔离

CREATE TABLE IF NOT EXISTS schema_migrations (
    version INTEGER PRIMARY KEY,
    applied_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

-- 系统租户/项目
CREATE TABLE IF NOT EXISTS projects (
    id BIGSERIAL PRIMARY KEY,
    name TEXT NOT NULL,
    code TEXT NOT NULL UNIQUE,
    environment TEXT NOT NULL DEFAULT 'dev',
    status TEXT NOT NULL DEFAULT 'active',
    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

-- 用户表 (隔离)
CREATE TABLE IF NOT EXISTS users (
    id BIGSERIAL PRIMARY KEY,
    account_id TEXT NOT NULL UNIQUE,
    name TEXT NOT NULL DEFAULT '',
    role TEXT NOT NULL DEFAULT 'user',
    created_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

-- 对话会话表 (隔离：各环境不得共享)
CREATE TABLE IF NOT EXISTS chat_sessions (
    id BIGSERIAL PRIMARY KEY,
    session_id TEXT NOT NULL UNIQUE,
    project_id BIGINT REFERENCES projects(id) ON DELETE CASCADE,
    user_id BIGINT REFERENCES users(id),
    title TEXT NOT NULL DEFAULT '新对话',
    model TEXT NOT NULL DEFAULT '',
    status TEXT NOT NULL DEFAULT 'active',
    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE INDEX IF NOT EXISTS idx_chat_sessions_uid ON chat_sessions(user_id);
CREATE INDEX IF NOT EXISTS idx_chat_sessions_pid ON chat_sessions(project_id);

-- 对话消息与历史流 (隔离：各环境不得共享)
CREATE TABLE IF NOT EXISTS chat_messages (
    id BIGSERIAL PRIMARY KEY,
    session_id TEXT NOT NULL REFERENCES chat_sessions(session_id) ON DELETE CASCADE,
    role TEXT NOT NULL, -- user / assistant / system / tool
    content TEXT NOT NULL,
    tool_calls JSONB,
    tokens INT NOT NULL DEFAULT 0,
    created_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE INDEX IF NOT EXISTS idx_chat_messages_sid ON chat_messages(session_id);

-- 智能体异步执行任务与审计日志 (隔离)
CREATE TABLE IF NOT EXISTS agent_tasks (
    id BIGSERIAL PRIMARY KEY,
    task_id TEXT NOT NULL UNIQUE,
    session_id TEXT REFERENCES chat_sessions(session_id),
    status TEXT NOT NULL DEFAULT 'pending', -- pending, running, completed, failed
    plan_steps JSONB NOT NULL DEFAULT '[]'::jsonb,
    result_summary TEXT NOT NULL DEFAULT '',
    error_message TEXT NOT NULL DEFAULT '',
    started_at TIMESTAMPTZ,
    finished_at TIMESTAMPTZ,
    created_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE INDEX IF NOT EXISTS idx_agent_tasks_status ON agent_tasks(status);