"""read-only flattened reporting views for Power BI

Revision ID: 0002
Revises: 0001
Create Date: 2026-07-13

The powerbi_ro MySQL user (created by db/init/01-powerbi-user.sh) has SELECT
on exactly these three views and nothing else.
"""
from alembic import op

revision = "0002"
down_revision = "0001"
branch_labels = None
depends_on = None

VW_NCR_FULL = """
CREATE OR REPLACE VIEW vw_ncr_full AS
SELECT
    n.id AS ncr_id,
    n.ncr_number,
    n.ncr_year,
    n.ncr_seq,
    n.created_at,
    n.job_number,
    d.name AS department,
    dc.name AS deviation_category,
    req.display_name AS requester,
    req.email AS requester_email,
    da.display_name AS disposition_authority,
    n.stage,
    n.stage_entered_at,
    DATEDIFF(UTC_TIMESTAMP(), n.stage_entered_at) AS days_in_stage,
    n.deviation_detail,
    n.qc_authority,
    n.work_order,
    n.disposition_notes,
    n.secondary_review_needed,
    (SELECT GROUP_CONCAT(u2.display_name ORDER BY u2.display_name SEPARATOR '; ')
       FROM ncr_secondary_assignees sa2
       JOIN users u2 ON u2.id = sa2.user_id
      WHERE sa2.ncr_id = n.id) AS secondary_authorities,
    n.operations_complete,
    n.operations_completed_at,
    opu.display_name AS operations_completed_by,
    n.qc_approval,
    n.inspection_notes,
    n.qc_closed,
    n.qc_closed_at,
    qcu.display_name AS qc_closed_by,
    n.labor_cost,
    n.material_cost,
    n.service_cost,
    n.other_cost,
    COALESCE(n.labor_cost, 0) + COALESCE(n.material_cost, 0)
      + COALESCE(n.service_cost, 0) + COALESCE(n.other_cost, 0) AS total_cost,
    n.costing_completed_at,
    n.closed_at,
    clu.display_name AS closed_by,
    ji.part_id,
    ji.part_description,
    ji.customer_name,
    ji.work_order_status,
    (SELECT COUNT(*) FROM attachments a WHERE a.ncr_id = n.id) AS attachment_count
FROM ncrs n
JOIN departments d            ON d.id  = n.department_id
JOIN deviation_categories dc  ON dc.id = n.deviation_category_id
JOIN users req                ON req.id = n.requester_id
JOIN users da                 ON da.id  = n.disposition_authority_id
LEFT JOIN users opu           ON opu.id = n.operations_completed_by_id
LEFT JOIN users qcu           ON qcu.id = n.qc_closed_by_id
LEFT JOIN users clu           ON clu.id = n.closed_by_id
LEFT JOIN job_info ji         ON ji.ncr_id = n.id
"""

VW_NCR_STAGE_HISTORY = """
CREATE OR REPLACE VIEW vw_ncr_stage_history AS
SELECT
    t.id AS transition_id,
    t.ncr_id,
    n.ncr_number,
    n.job_number,
    t.from_stage,
    t.to_stage,
    t.action,
    t.acted_at,
    u.display_name AS acted_by,
    u.email AS acted_by_email,
    t.note
FROM stage_transitions t
JOIN ncrs n  ON n.id = t.ncr_id
JOIN users u ON u.id = t.acted_by_id
"""

VW_NCR_COSTS = """
CREATE OR REPLACE VIEW vw_ncr_costs AS
SELECT
    n.id AS ncr_id,
    n.ncr_number,
    n.ncr_year,
    n.job_number,
    d.name AS department,
    dc.name AS deviation_category,
    n.created_at,
    n.closed_at,
    n.stage,
    n.labor_cost,
    n.material_cost,
    n.service_cost,
    n.other_cost,
    COALESCE(n.labor_cost, 0) + COALESCE(n.material_cost, 0)
      + COALESCE(n.service_cost, 0) + COALESCE(n.other_cost, 0) AS total_cost
FROM ncrs n
JOIN departments d           ON d.id  = n.department_id
JOIN deviation_categories dc ON dc.id = n.deviation_category_id
WHERE n.costing_completed_at IS NOT NULL
"""


def upgrade() -> None:
    op.execute(VW_NCR_FULL)
    op.execute(VW_NCR_STAGE_HISTORY)
    op.execute(VW_NCR_COSTS)


def downgrade() -> None:
    op.execute("DROP VIEW IF EXISTS vw_ncr_costs")
    op.execute("DROP VIEW IF EXISTS vw_ncr_stage_history")
    op.execute("DROP VIEW IF EXISTS vw_ncr_full")