-- BossAi 2.0 UIUX 重构 — 数据库迁移脚本
-- TASK-001: 案卡表 + sessions 扩展
-- TASK-002: 专家关系表
-- 幂等:可重复执行,已存在的对象跳过
-- 运行:psql -d mcp -f migrations/001_bossai_v2.sql

BEGIN;

-- ============================================================
-- TASK-001: 案卡(matters)表
-- ============================================================

CREATE TABLE IF NOT EXISTS matters (
    id                SERIAL PRIMARY KEY,
    code              TEXT NOT NULL UNIQUE,             -- 唯一业务代码 MTR_{YYYYMMDD}_{seq}
    user_phone        TEXT NOT NULL,                    -- 所属老板(手机号,关联 users.phone)
    scene             TEXT NOT NULL,                    -- legal / decision / life / emotion
    title             TEXT NOT NULL,                    -- 案卡标题(AI 生成或用户命名)
    status            TEXT NOT NULL DEFAULT 'new',      -- new / asking_facts / pending_confirm / analyzing / pending_expert / closed
    session_id        TEXT,                             -- 关联会话 sid(可空,旧会话无案卡)
    risk_level        TEXT,                             -- 可空: green / amber / orange / red
    summary           TEXT,                             -- 可空: AI 结论摘要
    closed_at         TIMESTAMPTZ,                      -- 闭环时间
    execution_result  TEXT,                             -- 可空: 顺利 / 受阻 / 未执行
    execution_note    TEXT,                             -- 可空: 执行情况备注
    created_at        TIMESTAMPTZ NOT NULL DEFAULT now(),
    updated_at        TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE INDEX IF NOT EXISTS idx_matters_user_phone ON matters(user_phone);
CREATE INDEX IF NOT EXISTS idx_matters_status ON matters(status);
CREATE INDEX IF NOT EXISTS idx_matters_user_status ON matters(user_phone, status);
CREATE INDEX IF NOT EXISTS idx_matters_created ON matters(created_at DESC);

-- 案卡状态流转合法性约束(通过 CHECK)
ALTER TABLE matters DROP CONSTRAINT IF EXISTS chk_matters_status;
ALTER TABLE matters ADD CONSTRAINT chk_matters_status CHECK (
    status IN ('new', 'asking_facts', 'pending_confirm', 'analyzing', 'pending_expert', 'closed')
);

ALTER TABLE matters DROP CONSTRAINT IF EXISTS chk_matters_scene;
ALTER TABLE matters ADD CONSTRAINT chk_matters_scene CHECK (
    scene IN ('legal', 'decision', 'life', 'emotion')
);

ALTER TABLE matters DROP CONSTRAINT IF EXISTS chk_matters_risk;
ALTER TABLE matters ADD CONSTRAINT chk_matters_risk CHECK (
    risk_level IS NULL OR risk_level IN ('green', 'amber', 'orange', 'red')
);

-- sessions 表扩展:关联案卡(若 sessions 表存在)
DO $$
BEGIN
    IF EXISTS (
        SELECT 1 FROM information_schema.tables WHERE table_name = 'sessions'
    ) AND NOT EXISTS (
        SELECT 1 FROM information_schema.columns
        WHERE table_name = 'sessions' AND column_name = 'matter_id'
    ) THEN
        ALTER TABLE sessions ADD COLUMN matter_id INTEGER REFERENCES matters(id);
        CREATE INDEX IF NOT EXISTS idx_sessions_matter ON sessions(matter_id);
    END IF;
END $$;

-- chat_messages 表扩展:关联案卡(用于无 sessions 表时通过消息关联)
DO $$
BEGIN
    IF NOT EXISTS (
        SELECT 1 FROM information_schema.columns
        WHERE table_name = 'chat_messages' AND column_name = 'matter_id'
    ) THEN
        ALTER TABLE chat_messages ADD COLUMN matter_id INTEGER REFERENCES matters(id);
        CREATE INDEX IF NOT EXISTS idx_chat_messages_matter ON chat_messages(matter_id);
    END IF;
END $$;

-- ============================================================
-- TASK-002: 专家关系(expert_relations)表
-- ============================================================

CREATE TABLE IF NOT EXISTS expert_relations (
    id                   SERIAL PRIMARY KEY,
    user_phone           TEXT NOT NULL,                 -- 老板手机号
    expert_id            INTEGER NOT NULL REFERENCES experts(id),
    consultation_count   INTEGER NOT NULL DEFAULT 0,    -- 咨询次数
    last_consulted_at    TIMESTAMPTZ,                   -- 最近咨询时间
    last_topic           TEXT,                          -- 最近咨询话题
    tags                 TEXT,                          -- 擅长领域标签(逗号分隔)
    created_at           TIMESTAMPTZ NOT NULL DEFAULT now(),
    updated_at           TIMESTAMPTZ NOT NULL DEFAULT now(),
    UNIQUE(user_phone, expert_id)
);

CREATE INDEX IF NOT EXISTS idx_expert_relations_user ON expert_relations(user_phone);
CREATE INDEX IF NOT EXISTS idx_expert_relations_expert ON expert_relations(expert_id);

COMMIT;

-- ============================================================
-- 回滚脚本(手动执行,需谨慎)
-- 反向执行:psql -d mcp -f migrations/001_bossai_v2_rollback.sql
-- ============================================================
-- BEGIN;
-- ALTER TABLE chat_messages DROP COLUMN IF EXISTS matter_id;
-- ALTER TABLE sessions DROP COLUMN IF EXISTS matter_id;
-- DROP TABLE IF EXISTS expert_relations;
-- DROP TABLE IF EXISTS matters;
-- COMMIT;