import { Router } from 'express'
import { query } from '../config/database.js'
import { sendSuccess, sendError, parsePagination } from '../middleware/error.js'
import type { AuthRequest } from '../middleware/auth.js'

const router = Router()

// ============================================================
// 产品生命周期 (T-170, T-173)
// ============================================================

router.get('/products', async (req: AuthRequest, res) => {
  try {
    const stage = req.query.stage as string
    const conditions: string[] = []
    const params: any[] = []
    if (stage) { conditions.push(`lifecycle_stage = $${params.length + 1}`); params.push(stage) }
    const where = conditions.length ? `WHERE ${conditions.join(' AND ')}` : ''
    const result = await query(`SELECT * FROM analytics.v3_product_lifecycle ${where} ORDER BY launch_date DESC`, params)
    sendSuccess(res, result.rows)
  } catch (err: any) { sendError(res, err.message) }
})

router.post('/products', async (req: AuthRequest, res) => {
  try {
    const { sku_code, sku_name, launch_date, lifecycle_stage } = req.body
    const result = await query(`
      INSERT INTO analytics.v3_product_lifecycle (sku_code, sku_name, launch_date, lifecycle_stage)
      VALUES ($1, $2, $3, $4)
      ON CONFLICT (sku_code) DO UPDATE SET sku_name = EXCLUDED.sku_name, lifecycle_stage = EXCLUDED.lifecycle_stage, updated_at = NOW()
      RETURNING *
    `, [sku_code, sku_name, launch_date, lifecycle_stage || '爬坡'])
    sendSuccess(res, result.rows[0])
  } catch (err: any) { sendError(res, err.message) }
})

// T-173: 产品生命周期自动追踪
router.post('/products/:id/track', async (req: AuthRequest, res) => {
  try {
    const result = await query(`SELECT * FROM analytics.v3_product_lifecycle WHERE id = $1`, [req.params.id])
    if (result.rows.length === 0) return sendError(res, 'Product not found', 404)
    const product = result.rows[0]
    const launchDate = new Date(product.launch_date)
    const now = new Date()
    const daysSinceLaunch = Math.floor((now.getTime() - launchDate.getTime()) / (1000 * 60 * 60 * 24))

    let stage = product.lifecycle_stage
    let survivalStatus = product.survival_status
    let firstWeekReportDate = product.first_week_report_date
    let day90ReportDate = product.day90_report_date

    if (daysSinceLaunch <= 7) stage = '爬坡'
    else if (daysSinceLaunch <= 90) stage = '成熟'
    else stage = '衰退'

    if (daysSinceLaunch >= 7 && !firstWeekReportDate) firstWeekReportDate = new Date().toISOString().slice(0, 10)
    if (daysSinceLaunch >= 90 && !day90ReportDate) {
      day90ReportDate = new Date().toISOString().slice(0, 10)
      survivalStatus = daysSinceLaunch > 180 ? '淘汰' : '存活'
    }

    await query(`UPDATE analytics.v3_product_lifecycle SET lifecycle_stage = $1, survival_status = $2, first_week_report_date = $3, day90_report_date = $4, updated_at = NOW() WHERE id = $5`,
      [stage, survivalStatus, firstWeekReportDate, day90ReportDate, req.params.id])
    sendSuccess(res, { tracked: true, daysSinceLaunch, stage, survivalStatus })
  } catch (err: any) { sendError(res, err.message) }
})

// ============================================================
// 顾客评价 (T-171, T-172)
// ============================================================

router.get('/reviews', async (req: AuthRequest, res) => {
  try {
    const { page, pageSize, offset } = parsePagination(req)
    const storeCode = req.query.store_code as string
    const category = req.query.category as string
    const sentiment = req.query.sentiment as string
    const conditions: string[] = []
    const params: any[] = []
    if (storeCode) { conditions.push(`store_code = $${params.length + 1}`); params.push(storeCode) }
    if (category) { conditions.push(`nlp_category = $${params.length + 1}`); params.push(category) }
    if (sentiment) { conditions.push(`nlp_sentiment = $${params.length + 1}`); params.push(sentiment) }
    const where = conditions.length ? `WHERE ${conditions.join(' AND ')}` : ''
    const countResult = await query(`SELECT count(*) AS total FROM analytics.v3_customer_review ${where}`, params)
    const result = await query(`SELECT * FROM analytics.v3_customer_review ${where} ORDER BY review_date DESC LIMIT $${params.length + 1} OFFSET $${params.length + 2}`, [...params, pageSize, offset])
    sendSuccess(res, result.rows, { total: parseInt(countResult.rows[0].total), page, page_size: pageSize })
  } catch (err: any) { sendError(res, err.message) }
})

router.post('/reviews', async (req: AuthRequest, res) => {
  try {
    const { review_source, store_code, store_name, sku_code, sku_name, rating, content, review_date } = req.body
    const nlpCategory = analyzeReviewCategory(content)
    const nlpSentiment = analyzeSentiment(content, rating)
    const result = await query(`
      INSERT INTO analytics.v3_customer_review (review_source, store_code, store_name, sku_code, sku_name, rating, content, nlp_category, nlp_sentiment, review_date)
      VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10) RETURNING *
    `, [review_source, store_code, store_name, sku_code, sku_name, rating, content, nlpCategory, nlpSentiment, review_date])
    sendSuccess(res, result.rows[0])
  } catch (err: any) { sendError(res, err.message) }
})

// T-172: 简单NLP归因（基于关键词匹配）
function analyzeReviewCategory(content: string): string {
  if (!content) return '其他'
  const lower = content.toLowerCase()
  if (/口味|味道|好吃|难吃|咸|淡|甜|辣|鲜/.test(lower)) return '口味'
  if (/服务|态度|慢|快|热情|冷漠/.test(lower)) return '服务'
  if (/环境|卫生|干净|脏|吵|安静/.test(lower)) return '环境'
  if (/异物|虫|头发|沙子|变质/.test(lower)) return '异物'
  if (/分量|少|多|够|不够/.test(lower)) return '分量'
  return '其他'
}

function analyzeSentiment(content: string, rating: number): string {
  if (rating >= 4) return '正面'
  if (rating <= 2) return '负面'
  if (content && /好|赞|满意|喜欢/.test(content)) return '正面'
  if (content && /差|烂|失望|难吃/.test(content)) return '负面'
  return '中性'
}

// 评价统计概览
router.get('/reviews/overview', async (req: AuthRequest, res) => {
  try {
    const storeCode = req.query.store_code as string
    const conditions: string[] = []
    const params: any[] = []
    if (storeCode) { conditions.push(`store_code = $${params.length + 1}`); params.push(storeCode) }
    const where = conditions.length ? `WHERE ${conditions.join(' AND ')}` : ''
    const result = await query(`
      SELECT
        count(*) AS total_reviews,
        avg(rating) AS avg_rating,
        count(*) FILTER (WHERE nlp_sentiment = '正面') AS positive,
        count(*) FILTER (WHERE nlp_sentiment = '负面') AS negative,
        count(*) FILTER (WHERE nlp_sentiment = '中性') AS neutral,
        count(*) FILTER (WHERE nlp_category = '口味') AS taste_count,
        count(*) FILTER (WHERE nlp_category = '服务') AS service_count,
        count(*) FILTER (WHERE nlp_category = '环境') AS env_count,
        count(*) FILTER (WHERE nlp_category = '异物') AS foreign_matter_count,
        count(*) FILTER (WHERE nlp_category = '分量') AS portion_count
      FROM analytics.v3_customer_review ${where}
    `, params)
    sendSuccess(res, result.rows[0])
  } catch (err: any) { sendError(res, err.message) }
})

// ============================================================
// 数据导入管道 (T-150~156)
// ============================================================

router.get('/import-logs', async (req: AuthRequest, res) => {
  try {
    const importType = req.query.type as string
    const conditions: string[] = []
    const params: any[] = []
    if (importType) { conditions.push(`import_type = $${params.length + 1}`); params.push(importType) }
    const where = conditions.length ? `WHERE ${conditions.join(' AND ')}` : ''
    const result = await query(`SELECT * FROM analytics.v3_data_import_log ${where} ORDER BY created_at DESC LIMIT 100`, params)
    sendSuccess(res, result.rows)
  } catch (err: any) { sendError(res, err.message) }
})

router.post('/import/trigger', async (req: AuthRequest, res) => {
  try {
    const { import_type } = req.body
    const result = await query(`
      INSERT INTO analytics.v3_data_import_log (import_type, status, started_at)
      VALUES ($1, 'running', NOW()) RETURNING *
    `, [import_type])
    sendSuccess(res, result.rows[0])
  } catch (err: any) { sendError(res, err.message) }
})

// T-153: 数据质量规则
router.get('/quality-rules', async (req: AuthRequest, res) => {
  try {
    const result = await query(`SELECT * FROM analytics.v3_data_quality_rule ORDER BY id`)
    sendSuccess(res, result.rows)
  } catch (err: any) { sendError(res, err.message) }
})

// T-154: 库存快照
router.get('/inventory-snapshot', async (req: AuthRequest, res) => {
  try {
    const date = (req.query.date as string) || new Date().toISOString().slice(0, 10)
    const storeCode = req.query.store_code as string
    const conditions = [`snapshot_date = $1`]
    const params: any[] = [date]
    if (storeCode) { conditions.push(`store_code = $2`); params.push(storeCode) }
    const result = await query(`SELECT * FROM analytics.v3_inventory_snapshot WHERE ${conditions.join(' AND ')} ORDER BY store_code, sku_code`, params)
    sendSuccess(res, result.rows)
  } catch (err: any) { sendError(res, err.message) }
})

// ============================================================
// 月度报告 (T-195)
// ============================================================

router.get('/reports', async (req: AuthRequest, res) => {
  try {
    const reportType = req.query.type as string
    const conditions: string[] = []
    const params: any[] = []
    if (reportType) { conditions.push(`report_type = $${params.length + 1}`); params.push(reportType) }
    const where = conditions.length ? `WHERE ${conditions.join(' AND ')}` : ''
    const result = await query(`SELECT * FROM analytics.v3_monthly_report ${where} ORDER BY report_month DESC LIMIT 50`, params)
    sendSuccess(res, result.rows)
  } catch (err: any) { sendError(res, err.message) }
})

router.post('/reports/generate', async (req: AuthRequest, res) => {
  try {
    const { report_month, report_type, store_code } = req.body
    const monthStart = report_month || new Date().toISOString().slice(0, 8) + '01'

    const achievementResult = await query(`
      SELECT store_code, store_name,
        revenue_target, COALESCE(s.received, 0) AS actual_revenue,
        CASE WHEN revenue_target > 0 THEN ROUND(COALESCE(s.received, 0) / revenue_target * 100, 2) ELSE 0 END AS achievement_rate
      FROM analytics.v3_store_monthly_target t
      LEFT JOIN analytics.mv_store_risk_rating_monthly s ON s.store_code = t.store_code AND s.month_start = t.month
      WHERE t.month = $1 ${store_code ? 'AND t.store_code = $2' : ''}
      ORDER BY achievement_rate DESC
    `, store_code ? [monthStart, store_code] : [monthStart])

    const avgRate = achievementResult.rows.length > 0
      ? (achievementResult.rows.reduce((s: number, r: any) => s + Number(r.achievement_rate || 0), 0) / achievementResult.rows.length).toFixed(1)
      : '0.0'
    const summary = `月度报告: ${achievementResult.rows.length}家门店, 平均达成率${avgRate}%`
    const content = JSON.stringify({ stores: achievementResult.rows })

    const result = await query(`
      INSERT INTO analytics.v3_monthly_report (report_month, report_type, store_code, content, summary)
      VALUES ($1, $2, $3, $4, $5)
      ON CONFLICT (report_month, report_type, store_code) DO UPDATE SET content = EXCLUDED.content, summary = EXCLUDED.summary
      RETURNING *
    `, [monthStart, report_type || 'monthly', store_code || null, content, summary])
    sendSuccess(res, result.rows[0])
  } catch (err: any) { sendError(res, err.message) }
})

// ============================================================
// 目标偏差分析 (T-112)
// ============================================================

router.get('/variance', async (req: AuthRequest, res) => {
  try {
    const month = (req.query.month as string) || new Date().toISOString().slice(0, 8) + '01'
    const result = await query(`SELECT * FROM analytics.v3_target_variance WHERE report_month = $1 ORDER BY achievement_pct ASC`, [month])
    sendSuccess(res, result.rows)
  } catch (err: any) { sendError(res, err.message) }
})

router.post('/variance/generate', async (req: AuthRequest, res) => {
  try {
    const month = (req.body.month as string) || new Date().toISOString().slice(0, 8) + '01'
    const achievementResult = await query(`
      SELECT t.store_code, t.store_name, t.revenue_target,
        COALESCE(s.received, 0) AS actual_revenue,
        CASE WHEN t.revenue_target > 0 THEN ROUND(COALESCE(s.received, 0) / t.revenue_target * 100, 2) ELSE 0 END AS achievement_pct
      FROM analytics.v3_store_monthly_target t
      LEFT JOIN analytics.mv_store_risk_rating_monthly s ON s.store_code = t.store_code AND s.month_start = t.month
      WHERE t.month = $1
    `, [month])

    for (const row of achievementResult.rows) {
      const variance = Number(row.actual_revenue) - Number(row.revenue_target)
      const reasons = []
      if (Number(row.achievement_pct) < 90) reasons.push('营收未达标')
      if (Number(row.achievement_pct) < 70) reasons.push('客流可能不足')
      if (Number(row.achievement_pct) < 50) reasons.push('需根因分析')

      await query(`
        INSERT INTO analytics.v3_target_variance (report_month, store_code, store_name, revenue_target, revenue_actual, achievement_pct, variance_amount, variance_reasons)
        VALUES ($1, $2, $3, $4, $5, $6, $7, $8)
        ON CONFLICT (report_month, store_code) DO UPDATE SET revenue_actual = EXCLUDED.revenue_actual, achievement_pct = EXCLUDED.achievement_pct, variance_amount = EXCLUDED.variance_amount, variance_reasons = EXCLUDED.variance_reasons
      `, [month, row.store_code, row.store_name, row.revenue_target, row.actual_revenue, row.achievement_pct, variance, reasons.join('; ')])
    }

    sendSuccess(res, { generated: achievementResult.rows.length, month })
  } catch (err: any) { sendError(res, err.message) }
})

// ============================================================
// 预算锁定 (T-113)
// ============================================================

router.get('/budget-locks', async (req: AuthRequest, res) => {
  try {
    const month = (req.query.month as string) || new Date().toISOString().slice(0, 8) + '01'
    const result = await query(`SELECT * FROM analytics.v3_budget_lock WHERE lock_month = $1 ORDER BY store_code`, [month])
    sendSuccess(res, result.rows)
  } catch (err: any) { sendError(res, err.message) }
})

router.post('/budget-locks', async (req: AuthRequest, res) => {
  try {
    const { lock_month, store_code, lock_reason, root_cause_analysis } = req.body
    const result = await query(`
      INSERT INTO analytics.v3_budget_lock (lock_month, store_code, lock_reason, root_cause_analysis)
      VALUES ($1, $2, $3, $4)
      ON CONFLICT (lock_month, store_code) DO UPDATE SET lock_reason = EXCLUDED.lock_reason, root_cause_analysis = EXCLUDED.root_cause_analysis
      RETURNING *
    `, [lock_month, store_code, lock_reason, root_cause_analysis])
    sendSuccess(res, result.rows[0])
  } catch (err: any) { sendError(res, err.message) }
})

router.patch('/budget-locks/:id/approve', async (req: AuthRequest, res) => {
  try {
    const { approval_status } = req.body
    await query(`UPDATE analytics.v3_budget_lock SET approval_status = $1, approved_by = $2 WHERE id = $3`,
      [approval_status, req.user?.name || 'system', req.params.id])
    sendSuccess(res, { updated: true })
  } catch (err: any) { sendError(res, err.message) }
})

export default router