"""Persistent definition of a Fusion financial report.

Each report (P&L, balance sheet, trial balance, GL) has ONE row in
fusion.report describing its metadata + line specs. The line specs
are stored as a JSON-typed field for flexibility (each line spec
includes account_type filter, sub-totaling rules, sign convention)."""

from odoo import _, api, fields, models


REPORT_TYPES = [
    ('pnl', 'Income Statement (P&L)'),
    ('balance_sheet', 'Balance Sheet'),
    ('trial_balance', 'Trial Balance'),
    ('general_ledger', 'General Ledger'),
    ('aged_receivable', 'Aged Receivable'),
    ('aged_payable', 'Aged Payable'),
    ('partner_ledger', 'Partner Ledger'),
]


class FusionReport(models.Model):
    _name = "fusion.report"
    _description = "Fusion Financial Report Definition"
    _order = "sequence, id"

    name = fields.Char(required=True, translate=True)
    code = fields.Char(
        required=True,
        help="Unique technical code (e.g. 'pnl', 'balance_sheet').",
    )
    report_type = fields.Selection(REPORT_TYPES, required=True)
    sequence = fields.Integer(default=10)
    description = fields.Text()
    active = fields.Boolean(default=True)

    # Layout config - stored as JSON for flexibility per report type.
    # Example for P&L:
    # [
    #   {"label": "Revenue", "account_type_prefix": "income_", "sign": 1},
    #   {"label": "Cost of Goods Sold", "account_type_prefix": "expense_direct_", "sign": -1},
    #   {"label": "Gross Profit", "compute": "subtotal", "above": 2},
    #   ...
    # ]
    line_specs = fields.Json(string="Line Specs")

    show_zero_balances = fields.Boolean(default=False)
    show_unposted = fields.Boolean(default=False)
    default_comparison_mode = fields.Selection(
        [
            ('none', 'No comparison'),
            ('previous_period', 'Previous Period'),
            ('previous_year', 'Previous Year'),
        ],
        default='none',
    )

    company_id = fields.Many2one(
        'res.company',
        default=lambda self: self.env.company,
    )

    _unique_company_code = models.Constraint(
        'UNIQUE(company_id, code)',
        'Report code must be unique per company.',
    )